Using X-rays to see inside the human body has revolutionised non-invasive medical diagnostics. However, the dose of X-rays required for imaging is far higher than background levels, due to the poor performance of the detector materials currently available. This can cause harm to patients, and in some cases even cancer.

A team of researchers, jointly led by the Universities of Oxford and Cambridge, have discovered that a solar cell material – bismuth oxyiodide (BiOI) – is capable of detecting X-ray dose rates over 250 times lower than the current best performing detectors used commercially. This has the potential to make medical imaging safer, and open up new opportunities in non-invasive diagnostics, such as X-ray video techniques. Their results are reported in the journal Nature Communications.

“We have developed BiOI single crystals into X-ray detectors that work over 100 times better than the current state-of-the-art for medical imaging,” said Dr Robert Hoye from the University of Oxford, who led the work. “BiOI is nontoxic, stable in air, and can be grown cost-effectively and at scale. We are very excited by the potential BiOI has to make the next generation of non-invasive diagnostics more accessible, safer, and more effective.”

BiOI is a nontoxic semiconductor that absorbs visible light and is stable in air. Owing to these qualities, over the past decade there has been a surge of interest in this material for solar cells (turning sunlight into clean electricity), photoelectrochemical cells (turning sunlight into fuels) and energy harvesting to power smart devices, among many other applications.

BiOI contains two heavy elements – bismuth and iodine – which allows the material to strongly absorb X-rays. However, previous attempts to make BiOI into X-ray detectors were ineffective due to significant energy losses from defects arising from the nanocrystalline nature of the detectors made.

The researchers developed and patented a method to grow high-quality single crystals of BiOI using a scalable vapour-based approach. The low defect density in these crystals led to stable and ultra-low dark currents, which was critical to substantially improve the sensitivity and detection limit of this material to X-rays.

“Showing that these simply-processed, low-temperature grown, stable crystals can give such high sensitivity for X-ray detection is quite remarkable,” said Professor Judith Driscoll from Cambridge’s Department of Materials Science and Metallurgy, who co-led the work. “We began working on this material, BiOI, several years ago, and we find it outshines other rival materials in a range of optoelectronic and sensing applications, when toxicity and performance are considered together.”

The researchers formed an interdisciplinary team to understand why BiOI works so well as an X-ray detector. They used advanced optical techniques to resolve processes taking place over a trillionth of a second, and coupled these with simulations to link these processes with what is happening at the atomic level.

Through this study, the team revealed the unusual way in which electrons couple to vibrations in the lattice. Unlike other bismuth-halide compounds, the electrons in BiOI remain delocalised, meaning that electrons can easily and rapidly move within the lattice of BiOI. At the same time, the unusual electron coupling with lattice vibrations results in an irreversible energy loss channel that would still be present even if the material were defect-free.

The researchers found that these losses can be overcome by cooling down the sample to reduce thermal energy, or by applying an electric field to rip away electrons from the lattice. The latter case is ideally matched with how X-ray detectors operate. By applying a small electric field, electrons can be transported over a millimetre length-scale, allowing the efficient extraction of electrons generated in the single crystals through the absorption of X-rays.

“We have built a microscopic quantum mechanical model of electrons and ions that can fully explain the remarkable optoelectronic properties of BiOI that make it such a good material for X-ray detection,” said Dr Bartomeu Monserrat from Cambridge’s Department of Materials Science and Metallurgy, who co-led the project. “This gives us a roadmap for designing even more materials with similarly advantageous properties.

This work offers important insights into how delocalised charge-carriers can be achieved in bismuth-halide compounds. The researchers are now working on applying these insights to design materials with similarly advantageous properties as BiOI, as well as how to tune the composition of BiOI to improve its transport properties further. They are also working on bringing the unique benefits of BiOI to society by devising routes to increase the size of the BiOI detectors, while preserving the exceptional properties found in single crystals.

The study also involved researchers from Imperial College London, Queen Mary University London, Technical University Munich and CNRS in Toulouse.

Reference:
R A Jagt, I Bravić, et al. ‘Layered BiOI single crystals capable of detecting low dose rates of X-rays.’ Nature Communications (2023). https://doi.org/10.1038/s41467-023-38008-4

Adapted from a story by the University of Oxford

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Seven outstanding Cambridge researchers have been elected as Fellows of the Royal Society, the UK’s national academy of sciences and the oldest science academy in continuous existence.

These individuals have pushed forward the boundaries of their respective fields and had a beneficial influence on the world beyond.Sir Adrian Smith, President of the Royal Society

The Royal Society is a self-governing Fellowship of many of the world’s most distinguished scientists drawn from all areas of science, engineering and medicine.

The Society’s fundamental purpose, as it has been since its foundation in 1660, is to recognise, promote and support excellence in science and to encourage the development and use of science for the benefit of humanity.

This year, a total of 80 researchers, innovators and communicators from around the world have been elected as Fellows of the Royal Society for their substantial contribution to the advancement of science. These include 59 Fellows, 19 Foreign Members and two Honorary Fellows.

Sir Adrian Smith, President of the Royal Society said: “I am delighted to welcome our newest cohort of Fellows. These individuals have pushed forward the boundaries of their respective fields and had a beneficial influence on the world beyond. This year’s intake have already achieved incredible things, and I have no doubt that they will continue to do so. I look forward to meeting them and following their contributions in future.” 

The Fellows and Foreign Members join the ranks of Stephen Hawking, Isaac Newton, Charles Darwin, Albert Einstein, Lise Meitner, Subrahmanyan Chandrasekhar and Dorothy Hodgkin.

The Cambridge Fellows are:

Professor Cathie Clarke FRS

Professor of Theoretical Astrophysics, Institute of Astronomy, and Fellow of Clare College

Clarke studies astrophysical fluid dynamics, including accretion and protoplanetary discs and stellar winds. She was the first to demonstrate how protoplanetary disc formation around low-mass young stars is determined by their radiation field. In 2017 she became the first woman to be awarded the Eddington Medal by the Royal Astronomical Society and in 2022 she became director of the Institute of Astronomy.

She said: “It’s a great honour to join the many Cambridge astrophysicists who have held this title. I would like to particularly pay tribute to the many junior colleagues, PhD students and postdocs who have contributed to my research.”

Professor Christopher Jiggins FRS

Professor of Evolutionary Biology (2014), Department of Zoology, and Fellow of St John’s College

Jiggins studies adaption and speciation in the Lepidoptera (butterflies and moths). In particular he is interested in studying how species converge due to mimicry as a model for understanding the predictability of evolution and the genetic and ecological causes of speciation. He demonstrated the importance of hybridisation and movement of genes between species in generating novel adaptations. He also works on the agricultural pest cotton bollworm and carries out genomic studies of the insect bioconversion species, black soldier fly.

He said: “I am amazed and delighted to receive this honour, and would thank all the amazing students, and postdocs that I have been lucky enough to work with over the years.”

Dr Philip Jones FRS

Senior Group Leader, Wellcome Sanger Institute and Professor of Cancer Development, University of Cambridge, and Fellow of Clare College

Jones studies how normal cell behaviour is altered by mutation in aging and the earliest stages of cancer development. He focuses on normal skin and oesophagus, which become a patchwork of mutant cells by middle age. He has found that different mutations can either promote or inhibit cancer development giving hope of new ways to prevent cancer in the future. He is also a Consultant in Medical Oncology at Addenbrooke’s Hospital in Cambridge.

He said: “I am delighted to be elected to the Fellowship of the Royal Society. This honour is a tribute to the dedication of my research team and collaborators and support of my mentors and scientific colleagues over many years.”

Dr Lori Passmore FRS

Group Leader, Structural Studies Division, MRC Laboratory of Molecular Biology, and Fellow of Clare Hall

Passmore a cryo-electron microscopist and structural biologist who works at the Medical Research Council (MRC) Laboratory of Molecular Biology and at the University of Cambridge. She is known for her work on multiprotein complexes involved in gene expression and the development of new supports for cryo-EM studies. She also studies the molecular mechanisms underlying Fanconi anemia, a rare genetic disease resulting in an impaired response to DNA damage.

She said: “I am so honoured to be recognised alongside such an exceptional group of scientists. I am grateful to all the trainees, collaborators and colleagues whom I have worked with over the past years – science is truly collaborative and this is a recognition of all the courageous work of many people.”

Professor Peter Sewell FRS

Professor of Computer Science, Department of Computer Science and Technology, and Fellow of Wolfson College

Sewell’s research aims to put the engineering of the real-world computer systems that we all depend on onto better foundations, developing techniques to make systems that are better-understood, more robust and more secure. He and his group are best known for their work on the subtle relaxed-memory concurrency behaviour and detailed sequential semantics of processors and programming languages. He co-leads the CHERI cybersecurity project, for which his team have established mathematically-proven security properties of Arm’s Morello industrial prototype architecture.

He said: “This honour is a testament to the work of many excellent colleagues over the years, without whom none of this would have been possible.”

Professor Ivan Smith FRS

Professor of Geometry, Centre for Mathematical Sciences, and Fellow of Caius College

Smith is a mathematician who deals with symplectic manifolds and their interaction with algebraic geometry, low-dimensional topology and dynamics. In 2007, he received the Whitehead Prize for his work in symplectic topology, highlighting the breadth of applied techniques from algebraic geometry and topology, and in 2013 the Adams Prize. 

He said: “I am surprised, delighted and hugely honoured to be elected a Fellow of the Royal Society. I’ve been very fortunate to work in a rapidly advancing field, learning it alongside many inspirational and generous collaborators, who should definitely share this recognition.”

Professor William Sutherland CBE FRS

Miriam Rothschild Chair of Conservation Biology, Department of Zoology and Professorial Fellow of St Catharine’s College

Sutherland is a conservation scientist who is interested in improving the processes by which decisions are made. This has involved horizon scanning to identify future issues to reduce the surprises of future developments. His main work has been the industrial-scale collation of evidence to determine which interventions are effective and which are not and then establishing processes for embedding evidence in decision making. He has developed a free, online resource, Conservation Evidence, summarising evidence for the effectiveness of conservation actions to support anyone making decisions about how to maintain and restore biodiversity and an open access book Transforming Conservation: a practical guide to evidence and decision making.

He said: “I am delighted that our work on the means of improving decision making in conservation and elsewhere has been recognised in this way and thank my numerous collaborators.”

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The protection offered by COVID-19 vaccination declines more rapidly in people with severe obesity than in those with normal weight, scientists at the Universities of Cambridge and Edinburgh have found. The study suggests that people with obesity are likely to need more frequent booster doses to maintain their immunity.

This poses a major challenge for health servicesSadaf Farooqi

Clinical trials have shown that COVID-19 vaccines are highly effective at reducing symptoms, hospitalisation and deaths caused by the virus, including for people with obesity. Previous studies have suggested that antibody levels may be lower in vaccinated people who have obesity and that they may remain at higher risk of severe disease than vaccinated people with normal weight. The reasons for this have, however, remained unclear.

This study, published in the journal Nature Medicine, shows that the ability of antibodies to neutralise the virus declines faster in vaccinated people who have obesity. The findings have important implications for vaccine prioritisation policies around the world.

During the pandemic, people with obesity were more likely to be hospitalised, require ventilators and to die from COVID-19. In this study, supported by the NIHR Bioresource and funded by UKRI, the researchers set out to investigate how far two of the most extensively used vaccines protect people with obesity compared to those with a normal weight, over time.

A team from the University of Edinburgh, led by Prof Sir Aziz Sheikh, looked at real-time data tracking the health of 3.5 million people in the Scottish population as part of the EAVE II study. They looked at hospitalisation and mortality from COVID-19 in adults who received two doses of COVID-19 vaccine (either Pfizer-BioNTech BNT162b2 mRNA or AstraZeneca ChAdOx1).

They found that people with severe obesity (a BMI greater than 40 kg/m2) had a 76% higher risk of severe COVID-19 outcomes, compared to those with a normal BMI. A modest increase in risk was also seen in people with obesity (30-39.9kg/m2), which affects a quarter of the UK population, and those who were underweight. ‘Break-through infections’ after the second vaccine dose also led to hospitalisation and death sooner (from 10 weeks) among people with severe obesity, and among people with obesity (after 15 weeks), than among individuals with normal weight (after 20 weeks).

Prof Sir Aziz Sheikh said: “Our findings demonstrate that protection gained through COVID-19 vaccination drops off faster for people with severe obesity than those with a normal body mass index. Using large-scale data assets such as the EAVE II Platform in Scotland have enabled us to generate important and timely insights that enable improvements to the delivery of COVID-19 vaccine schedules in a post-pandemic UK.”

The University of Cambridge team – jointly led by Dr James Thaventhiran, from the MRC Toxicology Unit and Prof Sadaf Farooqi from the Wellcome-MRC Institute of Metabolic Science – studied people with severe obesity attending the Obesity clinic at Addenbrooke’s Hospital in Cambridge, and compared the number and function of immune cells in their blood to those of people of normal weight.

They studied people six months after their second vaccine dose and then looked at the response to a third ‘booster’ vaccine dose over time. The Cambridge researchers found that six months after a second vaccine dose, people with severe obesity had similar levels of antibodies to the COVID-19 virus as those with a normal weight.

But the ability of those antibodies to work efficiently to fight against the virus (known as ‘neutralisation capacity’) was reduced in people with obesity. 55% of individuals with severe obesity were found to have unquantifiable or undetectable ‘neutralising capacity’ compared to 12% of people with normal BMI.

“This study further emphasises that obesity alters the vaccine response and also impacts on the risk of infection,” said Dr Agatha van der Klaauw from the Wellcome-MRC Institute of Metabolic Science and first author of the paper. “We urgently need to understand how to restore immune function and minimise these health risks.”

The researchers found that antibodies produced by people with severe obesity were less effective at neutralising the SARS-CoV-2 virus, potentially because the antibodies were not able to bind to the virus with the same strength.

When given a third (booster) dose of a COVID-19 vaccine, the ability of the antibodies to neutralise the virus was restored in both the normal weight and severely obese groups. But the researchers found that immunity again declined more rapidly in people with severe obesity, putting them at greater risk of infection with time.

Dr James Thaventhiran, a Group Leader from the MRC Toxicology Unit in Cambridge and co-lead author of the SCORPIO study said: “It is promising to see that booster vaccines restore the effectiveness of antibodies for people with severe obesity, but it is concerning that their levels decrease more quickly, after just 15 weeks. This shows that the vaccines work as well in people with obesity, but the protection doesn’t last as long.”

Prof Sadaf Farooqi from the Wellcome-MRC Institute of Metabolic Science and co-lead author of the SCORPIO study said: “More frequent booster doses are likely to be needed to maintain protection against COVID-19 in people with obesity. Because of the high prevalence of obesity across the globe, this poses a major challenge for health services”.

Reference

A A van der Klaauw et al., ‘Accelerated waning of the humoral response to COVID-19 vaccines in obesity’, Nature Medicine (2023). DOI: 10.1038/s41591-023-02343-2

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By Stuart Roberts

Two pages from Maimonides’ notebook in which he has listed words in Judaeo-Arabic and given Judaeo-Romance translations beneath.

A Visiting Researcher to Cambridge has found previously unknown evidence of the legendary Jewish philosopher writing in a Romance dialect in manuscript fragments dating from the 12^th century.

A scrap of 900-year-old paper – part of Cambridge’s Cairo Genizah collection of more than 200,000 fragments of writing chronicling life over 1,000 years in Egypt and the Middle East – has been identified as containing the handwriting of the legendary Jewish philosopher Moses Maimonides.

The pages are a glossary of basic terms relating to herbs, basic foods and colours and were identified by José Martínez Delgado, a visiting professor to Cambridge University Library’s Genizah Research Unit, from the Department of Semitic Studies at the University of Granada.

Around 60 fragments written by Maimonides have been found in the Cairo Genizah manuscripts, and most are written in Maimonides’ customary Judaeo-Arabic (Arabic language written with the Hebrew alphabet). His writings include letters, legal rulings, and early drafts of his important works.

What makes this fragment unique, however, is the fact that Maimonides has added the translation in a Romance dialect below some words. It is the first evidence for Maimonides knowing Romance, an evolving dialect version of Latin that is a pre-cursor to what would eventually become modern-day Spanish dialects and language.

The discovery has been covered widely in the Spanish press this week.

Maimonides was born in Cordoba in 1135. His codification of Jewish law (the Mishneh Torah) is still considered a cornerstone of Jewish law and ethics. Through such works, Maimonides attempts to show that every part of Jewish law serves a rational purpose and that nothing was demanded for the sake of obedience alone.

He influenced thinkers as diverse as Newton and Aquinas and set forth the philosophic foundations of Jewish belief and wider philosophy in works such as the Guide of the Perplexed. Maimonides also served as Head of the Jews in Egypt and was renowned for his medical and scientific knowledge. In addition to being one of the Jewish faith’s most important thinkers and philosophers, Maimonides was also physician to the court of the Muslim sultan Saladin.

Maimonides must have written these fragments – later deposited in the Cairo Genizah from where Cambridge’s collection derives – sometime between 1168 when he arrived in Egypt and 1204, the year of his death.

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“Something about the handwriting in these Cambridge fragments seemed familiar. At last, I realised what I was looking at. I had seen this handwriting before. I quickly sent a message to my friend Amir Ashur (at Tel Aviv University).

“I didn’t say what I was thinking – I just asked him to look at the fragment, too. Then came confirmation of my suspicions. Amir had seen what I had seen. We were looking at Maimonides’ handwriting, in some sort of Romance dialect.”

José Martínez Delgado

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Added Martínez Delgado: “The glossary covers four semantic categories: colours, flavours and aromas, actions, and food. Why was Maimonides collecting these words? What does it tell us about him?

“The sequence of the words is interesting, as we are seeing him ‘at work’, writing a progression of words that make sense to him. The terms don’t follow alphabetical order – they are arranged logically by basic associations (bread, water), and opposites (white, black). The category of colours (white, black, blue, red, green, yellow, purple), ends in ‘light’ and ‘dark’ and then moves to flavours and aromas. The connection between these is presumably the senses, moving from sight to taste to smell.

“The list of foods moves from basic foods (bread, water) to vegetables, to edible seeds (wheat, chickpea), to seeded fruits (olive, fig), to dried fruits/nuts (acorn, pistachio), to foods from other natural products (milk, honey). The list of actions first describes the basic actions undertaken by all animals (eat, sleep), and then moves to actions, feelings and emotions that are more specific to people. Interestingly, although the words are in a Romance dialect, the plurals seem to be Italian, so it is a very mixed text.

“As to why he was collecting the words? He was a physician, with students, so perhaps he was gathering the terms for a medical or educational reason, or testing himself on his vocabulary!”

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“The Cairo Genizah fragments have been in Cambridge for over 120 years, but the work of cataloguing and interpreting them is still ongoing.

 “Each discovery like this builds on our knowledge of Egypt in the Middle Ages and the lives of Jews living in Islamic lands. It’s a treasure trove for historians, but for many people it also represents a tangible link to the heritage of the Jewish community and its religious traditions.

“Through the Littman Genizah Educational Programme at Cambridge University Library we aim to make the manuscripts available to new audiences, from schools to adult learners. I will never tire of seeing the excitement and emotion on peoples’ faces when they see these manuscripts in person.”

Dr Melonie Schmierer-Lee
Research Associate at the Genizah Research Institute

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The Genizah collection is one of the greatest treasures among the world-class collections at Cambridge University Library.  

From the 9th to the 19th century, the Jewish community of Fustat (Old Cairo) deposited more than 200,000 unwanted writings in a purpose-built storeroom in the Ben Ezra synagogue.

This sacred storeroom was called the Genizah. A Genizah was a safe place to store away any old or unusable text that, because it contained the name of God, was considered too holy to simply throw out.

But when the room was opened in the late 19th century, alongside the expected Bibles, prayer books and works of Jewish law – scholars discovered the documents and detritus of everyday life: shopping lists, marriage contracts, divorce deeds, a 1,000-year-old page of child’s doodles and alphabets, Arabic fables, works of Muslim philosophy, medical books, magical amulets, business letters and accounts. Practically every kind of written text produced by the Jewish communities of the Near East throughout the Middle Ages had been preserved in that sacred storeroom.

Among the highlights of the remarkable collection are the earliest known example of a Jewish engagement deed (Shtar Shiddukhin, from 1119), showing the complex legal relations that existed around marriage, early fragments of the Bible in different languages, and an 11th century pre-nuptial agreement where the groom, Toviyya – who clearly had a poor reputation – was required to make a series of promises about his future behaviour.

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Cambridge University athletes showcased their talent and competitive spirit in two thrilling sports events recently, the British Universities & Colleges Sports (BUCS) Outdoor Athletics Championships and the Amateur Boxing Varsity.

The BUCS Outdoor Athletics Championships, held in Manchester, saw Cambridge athletes from Cambridge University Athletic Club and Cambridge University Hare and Hounds, clinch five medals. Some of the notable results included:

• Angus Harrington of St. John’s College securing a gold medal in the 800m event, making him the BUCS Champion for the 2022-23 season. 
• Jeremy Dempsey from Girton College claiming the silver medal in the highly competitive 1500m race. 
• Reese Robinson of Jesus College displaying remarkable skill in the Triple Jump event, earning a well-deserved bronze medal. 
• Niamh Bridson Hubbard from Magdalene College also securing a bronze medal in the 1500m event.
• Mary Adeniji of Newnham College impressed with a bronze medal in the Long Jump.

In addition to the medalists, several other Cambridge students reached the finals and narrowly missed out on podium finishes, underscoring the depth of talent within the university.

The weekend included six students who are part of Cambridge’s UCAPP programme, showcasing the university’s commitment to nurturing exceptional athletic talent. 

The BUCS success followed another great triumph for Cambridge University Amateur Boxing Club (CUABC) in the 114th Amateur Boxing Varsity in March. The Amateur Boxing Varsity stands as the longest-running amateur boxing fixture in the world since its inception in 1897.

Cambridge’s Varsity Squad, comprising 12 fighters, travelled to Oxford where victory for the CUABC boxers unfolded in front of a boisterous crowd of 750 Oxford supporters. The final score was 6-3 and included 3 early stoppages by technical knockout. 

Cambridge’s victory further extended their lead in the overall score, with the tally now standing at 58-56 in Cambridge’s favour, reflecting the close competition between the two universities.

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Researchers have calculated the carbon footprint for the full life cycle of fertilisers, which are responsible for approximately five percent of total greenhouse gas emissions – the first time this has been accurately quantified – and found that carbon emissions could be reduced to one-fifth of current levels by 2050.

Our work gives us a good idea of what’s technically possible, and where interventions would be meaningful – it’s important that we aim interventions at what matters the most, in order to make fast and meaningful progress in reducing emissionsAndré Cabrera Serrenho

The researchers, from the University of Cambridge, found that two-thirds of emissions from fertilisers take place after they are spread on fields, with one-third of emissions coming from production processes.

Although nitrogen-based fertilisers are already known to be a major source of greenhouse gas emissions, this is the first time that their overall contribution, from production to deployment, has been fully quantified. Their analysis found that manure and synthetic fertilisers emit the equivalent of 2.6 gigatonnes of carbon per year – more than global aviation and shipping combined.

Carbon emissions from fertilisers urgently need to be reduced; however, this must be balanced against the need for global food security. Earlier research has estimated that 48% of the global population is fed with crops grown with synthetic fertilisers, and the world’s population is expected to grow by 20% by 2050.

The Cambridge researchers say that a combination of scalable technological and policy solutions are needed to reduce fertiliser emissions while maintaining food security. However, they estimate that if such solutions could be implemented at scale, the emissions from manure and synthetic fertilisers could be reduced by as much as 80%, to one-fifth of current levels, without a loss of productivity. Their results are reported in the journal Nature Food.

“Incredibly, we don’t actually know how many chemicals we produce globally, where they end up, where and how they accumulate, how many emissions they produce, and how much waste they generate,” said co-author Dr André Cabrera Serrenho from Cambridge’s Department of Engineering.

Serrenho and his co-author Yunhu Gao undertook a project to accurately measure the total impacts of fertilisers, one of the two main products of the petrochemical industry. Of all the products made by the petrochemical industry, the vast majority – as much as 74% – are either plastics or fertilisers.

“In order to reduce emissions, it’s important for us to identify and prioritise any interventions we can make to make fertilisers less harmful to the environment,” said Serrenho. “But if we’re going to do that, we first need to have a clear picture of the whole lifecycle of these products. It sounds obvious, but we actually know very little about these things.”

The researchers mapped the global flows of manure and synthetic fertilisers and their emissions for 2019, along all stages of the lifecycle, by reconciling the production and consumption of nitrogen fertilisers and regional emission factors across nine world regions.

After completing their analysis, the researchers found that unlike many other products, the majority of emissions for fertilisers occur not during production, but during their use.

“It was surprising that this was the major source of emissions,” said Serrenho. “But only after quantifying all emissions, at every point of the lifecycle, can we then start looking at different mitigation methods to reduce emissions without a loss of productivity.”

The researchers listed and quantified the maximum theoretical impact of different mitigation methods – most of these are already known, but their maximum potential effect had not been quantified.

Emissions from the production of synthetic fertilisers are mostly from ammonia synthesis, partly due to chemical reactions used in the production process. The most effective mitigation at the production stage would be for the industry to decarbonise heating and hydrogen production. Additionally, fertilisers could be mixed with chemicals called nitrification inhibitors, which prevent bacteria from forming nitrous oxide. However, these chemicals are likely to make fertilisers more expensive.

“If we’re going to make fertilisers more expensive, then there needs to be some sort of financial incentive to farmers and to fertiliser companies,” said Serrenho. “Farming is an incredibly tough business as it is, and farmers aren’t currently rewarded for producing lower emissions.”

The single most effective way to reduce fertiliser-associated emissions, however, would be to reduce the amount of fertilisers that we use. “We’re incredibly inefficient in our use of fertilisers,” said Serrenho. “We’re using far more than we need, which is economically inefficient and that’s down to farming practices. If we used fertiliser more efficiently, we would need substantially less fertiliser, which would reduce emissions without affecting crop productivity.”

The researchers also looked at the mix of fertilisers used around the world, which varies by region. The researchers say that replacing some of the fertilisers with the highest emissions, such as urea, with ammonium nitrate worldwide could further reduce emissions by between 20% and 30%. However, this would only be beneficial after decarbonising the fertiliser industry.

“There are no perfect solutions,” said Serrenho. “We need to rethink how we produce food, and what sorts of economic incentives work best. Perhaps that means paying farmers to produce fewer emissions, perhaps that means paying more for food. We need to find the right mix of financial, technological and policy solutions to reduce emissions while keeping the world fed.”

Serrenho and Gao estimate that by implementing all the mitigations they analysed, emissions from the fertiliser sector could be reduced by as much as 80% by 2050.

“Our work gives us a good idea of what’s technically possible, what’s big, and where interventions would be meaningful – it’s important that we aim interventions at what matters the most, in order to make fast and meaningful progress in reducing emissions,” said Serrenho.

The research was part of the C-THRU project, led by Professor Jonathan Cullen, where researchers from four UK and US Universities are working to bring clarity to the emissions from the global petrochemical supply chain.

Reference:
Yunhu Gao and André Cabrera Serrenho. ‘Greenhouse gas emissions from nitrogen fertilisers could be reduce by up to one-fifth of current levels by 2050 with combined interventions.’ Nature Food (2023). DOI: 10.1038/s43016-023-00698-w

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Researchers have found that the movement of glaciers in Greenland is more complex than previously thought, with deformation in regions of warmer ice containing small amounts of water accounting for motion that had often been assumed to be caused by sliding where the ice meets the bedrock beneath.

The international team of researchers, led by the University of Cambridge, used computer modelling techniques based on earlier fibre-optic measurements from the Greenland Ice Sheet to build a more detailed picture of the behaviour of the world’s second-largest ice sheet.

Their results, reported in the journal Science Advances, could be used to develop more accurate predictions of how the Greenland Ice Sheet will continue to move in response to climate change.

Mass loss from the Greenland Ice Sheet has increased sixfold since the 1980s and is now the single largest contributor to global sea-level rise. Around half of this mass loss is from surface meltwater runoff, while the other half is driven by the discharge of ice directly into the ocean by fast-flowing glaciers that reach the sea.

The RESPONDER project, funded by the European Research Council, is exploring the dynamics of the Greenland Ice Sheet using a combination of physical measurements and computer modelling.

The current research builds on earlier observations reported by the RESPONDER team in 2021 using fibre-optic cables. In that work, the team found that the temperature of ice sheets does not vary as a smooth gradient, but is far more heterogeneous, with areas of highly localised deformation warming the ice further.

The borehole measurements also showed that the ice at the base contains small amounts – up to roughly two percent – of water. In some parts of the ice sheet, this mixed ice-water layer, called temperate ice, was around eight metres thick, but in other parts it was up to 70 metres thick.

“The addition of even tiny amounts of water softens the ice considerably, transforming it into a unique material with substantially altered mechanical characteristics,” said first author Dr Robert Law, who completed the work while based at Cambridge’s Scott Polar Research Institute and is now based at the University of Bergen. “We wanted to know why the thickness of this layer varied so much, because if we don’t fully understand it, our models of ice sheet behaviour won’t fully capture the physical processes occurring in nature.”

“The textbook view of glacier motion is that it occurs with a neat partitioning of basal sliding and internal deformation, and that both are well understood,” said co-author and RESPONDER project leader Professor Poul Christoffersen, who is based at SPRI. “But that’s not what we observed when we looked carefully in boreholes with new techniques. With less detailed observations in the past, it was difficult to get a really good picture of how the ice sheet moves and even more challenging to replicate it with computer models.”

Law, Christoffersen and their colleagues from the UK, US, Switzerland and France developed a model based on their earlier borehole measurements that can account for all of the new observations.

Importantly, they accounted for natural variations in the landscape at the base of the ice, which, in Greenland, is full of rocky hills, basins and deep fjords. The researchers found that as a glacier moves over a large obstacle or hill, there is a deformation and heating effect which sometimes extends several hundred metres from the ice sheet base. Previously, this effect was omitted in models.

“The stress on the ice base is highest at the tops of these hills, which leads to more basal sliding,” said Law. “But so far most models have not accounted for all of these variations in the landscape.”

By incorporating these variations, the model developed by the researchers showed that a variable layer of temperate ice forms as the glacier moves over the landscape, whether the glacier itself is fast- or slow-moving. The thickness of this temperate ice layer agrees with the earlier borehole measurements, but diverges significantly from standard modelling methods used to predict sea level rise from ice sheets.

“Because of this hilly landscape, the ice can go from sliding across its base almost entirely to hardly sliding at all, over short distances of just a few kilometres,” said Law. “This directly influences the thermal structure — if you’ve got less basal sliding then you’ve got more internal deformation and heating, which can lead to  the layer of temperate ice getting thicker, altering the mechanical properties of the ice over a broad area. This temperate basal ice layer can actually act like a deformation bridge between hills, facilitating the fast motion of the much colder ice directly above it.”

The researchers hope to use this improved understanding to build more accurate descriptions of ice motion for the ice sheet models used in predicting future sea level rise.

The research was funded in part by the European Union and the Natural Environment Research Council (NERC), part of UK Research and Innovation (UKRI).

Reference:
Robert Law et al. ‘Complex motion of Greenland ice sheet outlet glaciers with basal temperate ice.’ Science Advances (2023). DOI: 10.1126/sciadv.eabq5180

Professor Dame Athene Donald has quite the list of firsts under her belt: first female postdoc in the Materials Science and Engineering Department at Cornell University, first female lecturer in Cambridge’s Physics Department, first female professor in any of Cambridge’s Physical Sciences and first female Master at Churchill College.

She is considered by many to be a role model for future generations of young female scientists. She’s a Fellow of the Royal Society, has been awarded several prizes by the Institute of Physics (CV Boys Prize, Mott Medal, and Faraday Medal), and in 2009, was awarded the L’Oréal-UNESCO Award for Europe for Women in Science.

So it may seem surprising that when asked what attracted her to study physics, she says simply that it just made sense to her: there was no moment of inspiration, no female scientist that served as a role model, just a young girl who understood.

She acknowledges that she was fortunate enough to attend a girls’ grammar school where she was taught by a teacher who had qualified in physics at Oxford, but says of her teacher: “She was always capable of answering my questions, but it wasn’t so much she inspired me, it was that she didn’t turn me off.”

From Camden to Churchill

After studying at Camden School for Girls, Donald arrived at Girton College, Cambridge in 1971 – at the time an all-women college – Donald was not the first in her family to go to university, though most had studied subjects such as Law.

She would go on to earn a bachelor’s degree in Natural Science (Theoretical Physics), followed by a PhD in 1977 for research on electron microscopy of grain boundary embrittled systems. This meant trying to understand why some trace elements would migrate and segregate to the boundaries between individual crystals in a sample.

“Because there were no mixed colleges, there was essentially a cap on the number of women in the university,” Donald says. “There weren’t many girls.”

After heading to Cornell University in the United States, where she spent four years as a postdoctoral research associate in the Department of Materials Science and Engineering, Donald returned to Cambridge and has been here ever since.

“I did not know at the time I was the first female lecturer in the department.”

At the time, Donald thought little of being in a minority, and it was not until the late 1990s that she realised that being a woman might be a disadvantage.

“People didn’t necessarily take me seriously, and at first, I assumed it was because I was working in an area that wasn’t mainstream physics,” she says. “I worked on food, on starch, so I was accused of doing domestic science.”

In the late 90s, Donald saw a report from MIT about the status of women in their science faculty and started to question how much being a woman had put her at a disadvantage.

“I suddenly realised all the things that were happening to me were very similar, the sense that you were not quite taken seriously, or that your voice wasn’t as persuasive, or the feeling that ‘I’m just not good enough’, that it’s my fault. I realised the problems were perhaps systemic, and that was very uncomfortable.”

She recalls several instances that demonstrate the bias experienced by women in science: a driver collecting her at a railway station saying “I was expecting a man”, letters addressed to “Sir Donald…”, a meeting of a research council’s grant giving committee, where she was greeted by a disgruntled member complaining that the meeting papers were out late. “Obviously, they thought I was part of the secretariat,” she reflects.

In October 2014, Donald became the first female Master of Churchill College.

Science… not just for boys

Later this year will see the release of Donald’s first book, Not Just for the Boys: Why We Need More Women in Science, which highlights the obstacles faced by women in science and explores historical attitudes towards women doing science, and what progress has, or has not, been made.

There is a widely-recognised shortage of women in STEM subjects (science, technology, engineering and maths). According to a report released by the Institute of Physics in 2017, for more than two decades only a fifth of A-level physics students have been girls.

Tackling the problem means starting far earlier than you might think. “You have to start really early, because this idea of gendering of subjects starts incredibly early. So, get rid of boys’ and girls’ toys, for instance,” she suggests.

Front cover of Professor Dame Athene Donald’s new book: Not just for the boys: Why we need more women in science

As an example of quite how ingrained attitudes are, Donald mentions Katharine Birbalsingh, head of the Michaela Community School in north-west London and (until very recently) the chair of the government’s Social Mobility Commission. Birbalsingh raised eyebrows in April 2022 when she told MPs that the low uptake of physics at A-Level was because girls did not like hard maths.

At the time, Donald told the Guardian that the comments made by Birbalsingh were “terrifying” and “quite damaging” and that it is not “a case of campaigning for more girls to do physics, it’s a case of making sure that girls aren’t discouraged by remarks like this”.

“We want girls to be free to pursue what they are good at,” she says, “and, equally, boys should also be able to go into professions like nursing. We are not in a society like that.”

Part of the problem is the ingrained unconscious assumption about what a stereotypical scientist looks like, she adds, “such as the myth of the lone scientist with sticking up hair and holding a test tube”.

A 2020 report published by Teach First, a charity aimed at addressing educational disadvantage in England and Wales, found that only half of British adults (49%) can name a female scientist, dead or alive. They also point out that not a single female scientist is mentioned in the GCSE science curriculum.

“If you are a 12-year-old girl and you’re not being exposed to this, then you may think I don’t belong”, Donald points out.

Where are the scientists like Marie Curie, the first woman to win a Nobel Prize, and astrophysicist Jocelyn Bell Burnell, whose discovery of radio pulsars changed astronomy? Why are children not learning about people such as Fabiola Gianotti, Director General of CERN?

There are also inherent problems with the system, including the age at which young people make decisions about their GCSEs and A-levels, she adds.

“You are very impressionable at 14 and the pressure and recognition from our peers is important at that age,” says Donald. “If a boy in your class says ‘That’s a bit nerdy’, then you may choose not to do [science] and then regret it later. I think it’s tough unless you’ve got parental support or teacher support.”

“You have to tackle the problem in schools to give those girls who want to do science the courage to do it.”

A female future

To see what is possible, we should look to the way STEM subjects are viewed in high-income countries versus low- and middle-income countries.

A study by Drawing the Future released in 2018 suggested that the most popular job for children in the UK was either a sportsman or sportswoman and that “the general trends suggest that in some developing countries children have more practical and high professional ambitions such as a Doctor or Teacher.

Donald points out that in low- and middle-income countries, the formal lines of female and male jobs are different and much less apparent. There, children see science and engineering as a way of improving their own lives and country.

A series of conversations with distinguished professional women, hosted by the Master of Churchill College, Professor Dame Athene Donald

She is hopeful that attitudes here may change, though. “The young today are so concerned about climate change that attitudes may be changing, and the pandemic may be instrumental in that shift, too.”

When Donald’s book appears on bookshelves in May, she hopes it will make people stop and think about the shortage of women in STEM and how we might address it. While the issues may not be new to some, there will be others – including those who can effect change – who do not appreciate how ingrained and systemic the problems are.

“If we’re going to change society, we need these people to think harder,” she says. “I hope this book is not only read by young girls hoping to study science but also by those who can really make a difference – policy makers, teachers, and parents. These are the people who can help change attitudes and encourage more girls into science.”

“If we’re going to change society, we need these people to think harder.”

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Published: Friday 10th February 2023
With thanks to:

_{Dame Professor Athene Donald}

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_{Words: Zoe Smith
Photography: Lloyd Mann}

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_{The text in this work is licensed under a Creative Commons Attribution 4.0 International License}

Could a new theory of the Universe be Stephen Hawking’s biggest legacy? How has popular music addressed political conflict? Are the big tech firms the new colonialists? And is the education system making the crisis in mental health in young women and girls worse?

These are a few of the questions set to be addressed during one of the largest festivals of its kind in the country, the annual Cambridge Festival, which launches its 2023 programme on Monday 13 February. Bookings open on the same day.

Coordinated by the University of Cambridge, the Festival, which runs from 17 March until 2 April, packs a hefty cultural punch with over 360 in person and online, mostly free events. Subjects range from politics and technology to health and climate change. There are five core themes: Power, Society, Health, Environment and Discovery.

Some of the highlights this year include talks about several new books. An event tipped to be hugely popular is the talk about one of the most widely anticipated new books of the year, ON THE ORIGIN OF TIME: STEPHEN HAWKING’S FINAL THEORY (31 March). Due to be published by Penguin in April, the book is a striking new vision of the Universe by Stephen Hawking and his close collaborator cosmologist Professor Thomas Hertog. During his talk, Professor Hertog discusses his book and the theory.  

He commented: “Holed up in the theoretical physics department at Cambridge, Stephen Hawking and I worked shoulder to shoulder for 20 years, developing a new theory of the cosmos that could account for the emergence of life. Peering into the extreme quantum physics of cosmic holograms and venturing far back in time to our deepest roots, we were startled to find a deeper level of evolution in which the physical laws themselves transform until particles, forces, and even time itself fades away. Once upon a time, perhaps, there was no time?”

A further event, focussing on another new book due out later this year, explores how popular music has addressed political conflict. In COMBAT ROCK: POPULAR MUSIC AND THE NORTHERN IRELAND CONFLICT (22 March), Dr Sean Campbell (Anglia Ruskin University) examines how popular musicians engaged with the Northern Ireland conflict in the period between the IRA hunger strikes (1980–81) and the British government’s ‘broadcasting ban’ (1988).

Another current conflict, the war in Ukraine and climate disasters have focused people’s minds on issues of food security. In HOW CAN WE IMPROVE OUR FOOD SECURITY? (27 March), experts address the practical and political problems around food security and look to what history can teach us. With Professor Tim Lang, a former consultant to the WHO and the UN, and a special advisor to four House of Commons Select Committee inquiries; Anoop Tripathi, a PhD student whose current research seeks to find a way to increase rice yields; David Christian Rose, Professor of Sustainable Agricultural Systems; and Dr Emelyn Rude, founding editor of Eaten: the Food History Magazine. The event chair is Dr Nazia Mintz Habib, Research Centre Director for the Centre for Resilience and Sustainable Development.

Staying with the topic of food, in GROWING UP IN A CHANGING ENVIRONMENT: WHAT REALLY INFLUENCES WHAT YOUNG PEOPLE EAT? (29 March), Dr Eleanor Winpenny, Dr Tiago Canelas and Mr Struan Tait from the MRC Epidemiology Unit in Cambridge present evidence from recent research in the UK and abroad, investigating how people’s diet changes as they go through adolescence and early adulthood, and the different lifestyle changes that appear to drive changes in diet. They discuss their most recent research, international new research (soon to be published), and the launch of a new pilot study.

Young people come into focus again as part of the next event, CLIMATE CHANGE: FROM DESPAIR TO ACTION (30 March). We know that climate change is speeding up and that it is a threat to the future of the planet, but can our political structures adapt to the pace of change? How can we better confront climate misinformation around the world? What role can technology play? And how can we educate young people for the challenges to come? With Professor Laura Diaz Anadon, a Lead Author of the IPCC Working Group III on Mitigating Climate Change; Professor Peter Sutoris, an environmental anthropologist; Samira Patel, a PhD student in Polar Studies at the University of Cambridge; and Dr Ramit Debnath, the inaugural Cambridge Zero Fellow. The event chair is Professor Emily Shuckburgh, Director of Cambridge Zero.

Moving onto one of the big issues of the day; big tech. Are the big tech firms, whose income is higher than many countries’ GDP, now acting like the colonialists of the past as they assert their power both in space and on Earth? Are governments able to restrain them? These questions and more are debated in BIG TECH: THE NEW COLONIALISTS? (29th March). With Dr Sebastián Lehuedé from Harvard University and University of Cambridge, and Professor Jaideep Prabhu, Alina Utrata, a PhD Candidate in Politics and International Studies, and tech law academic Dr Jennifer Cobbe from the University of Cambridge.  

In a related event, ARTIFICIAL INTELLIGENCE: CAN SYSTEMS LIKE CHATGPT AUTOMATE EMPATHY? (31 March), Dr Marcus Tomalin (University of Cambridge), considers some of the social and ethical implications of creating automated systems that imitate human-like empathetic responses convincingly despite having no actual capacity for empathy. As part of his talk, Dr Tomalin explains how these systems, such as Chat-GPT, Siri and Alexa, work and how they are designed to seem empathetic.

The media comes under scrutiny in this next event. In IS POPULISM DESTROYING THE MEDIA? (20 March, online), Emily Maitlis, former BBC Newsnight anchor, and Ayala Panievsky, a PhD Gates-Cambridge scholar whose research focuses on the future of journalism, explore the impact of populism on the media. Is it affecting how and what journalists write? How can we ensure reporters don’t self-censor in an age where accurate information is vital? The event chair is Dorothy Byrne, former Head of News and Current Affairs at Channel 4. 

Assisted dying is one of the many controversial topics explored during the Festival. In THE BARON DE LANCEY LECTURE 2023 – ASSISTED DYING: SLIPPERY SLOPES AND UNINTENDED CONSEQUENCES (16 March), Professor Emily Jackson (London School of Economics) discusses the practical pitfalls in trying to legislate to legalise assisted dying. Not only are supporters and opponents of legalisation often talking past each other, but also as one problem is solved, another may be created.

Another controversial topic examined is whether the education system makes the crisis in mental health in young women and girls worse. Unprecedented levels of anxiety, depression and eating disorders in young women and girls have prompted government demands for universities and schools to offer greater support. But a major event, THE CRISIS IN MENTAL HEALTH IN YOUNG WOMEN AND GIRLS: DOES OUR EDUCATION SYSTEM MAKE IT WORSE? WHAT SHOULD WE DO? hosted by Murray Edwards Policy Centre for the Wellbeing of Young Women and Girls, asks if the demands of our educational system are in fact key drivers of distress.

Two of the country’s leading thinkers in this area Professor of Psychology and Cognitive Neuroscience Sarah-Jayne Blakemore and Professor of Child and Adolescent Psychiatry Tamsin Ford examine some potential solutions. The event is chaired by Murray Edwards College President Dorothy Byrne, who was Head of News and Current Affairs at Channel 4.

Finally, on a lighter note, Festival favourite Jack Ashby, Assistant Director of the Museum of Zoology in Cambridge, presents two lively talks about the weird and wonderful animals of Australia. During DON’T CALL ME WEIRD: AUSTRALIA’S AMAZING MAMMALS (26 March), he explains why he thinks Australia’s mammals are the best in the world. From the platypus, the only mammals that can produce venom, detect electricity and lay eggs, to wombats who poop cubes, defend themselves with reinforced rears, and whose teeth never stop growing. In PLATYPUS MATTERS: THE EXTRAORDINARY STORY OF AUSTRALIAN MAMMALS (29 March), Jack returns to explore how the world sees Australian mammals and what this means for their conservation.

Photo by Mikaela Egan on Unsplash

Commenting on the programme launch, Cambridge Festival Manager, David Cain said: “We’re incredibly excited to be revealing this year’s Cambridge Festival programme. Since its launch in 2020, the Festival has tackled some of our biggest challenges and delved into many controversial subjects. Through a series of interdisciplinary events, the aim is to understand where we have come from and where we’re headed; to provoke conversation and encourage everyone to see things in a new or different way.

“The Festival is often meaty and though-provoking, but it also has a lighter element with performance, comedy, and loads of fun things for kids and families to do.

“Have a look through the programme, I’m positive there will be something there to spark interest no matter what age you are.”

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The full programme launches and bookings open on Monday 13 February via the Festival website:  www.festival.cam.ac.uk

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Keep up to date with the Festival on social media: Instagram @Camunifestivals | Facebook: @CambridgeFestival | Twitter: @Cambridge_Fest

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The Festival sponsors and partners are AstraZeneca and RAND Europe. The Festival media partners are BBC Radio Cambridgeshire and Cambridge Independent.

Fossil bones from two newly-described penguin species, one of them thought to be the largest penguin to ever live – weighing more than 150 kilograms, more than three times the size of the largest living penguins – have been unearthed in New Zealand.

An international team, including researchers from the University of Cambridge, reported the discovery in the Journal of Paleontology. The paper’s senior author, Alan Tennyson from the Museum of New Zealand Te Papa Tongarewa, discovered the fossils in 57 million-year-old beach boulders in North Otago, on New Zealand’s South Island, between 2016 and 2017.

The fossils were then exposed from within the boulders by Al Manning. They have been identified as being between 59.5 and 55.5 million years old, marking their existence as roughly five to 10 million years after the end-Cretaceous extinction which led to the extinction of non-avian dinosaurs.

The team used laser scanners to create digital models of the bones and compare them to other fossil species, flying diving birds like auks, and modern penguins. To estimate the size of the new species, the team measured hundreds of modern penguin bones and calculated a regression using flipper bone dimensions to predict weight.

They concluded that the largest flipper bones belong to a penguin that tipped the scales at an astounding 154 kg. In comparison, emperor penguins, the tallest and heaviest of all living penguins, typically weigh between 22 and 45 kg.

“Fossils provide us with evidence of the history of life, and sometimes that evidence is truly surprising,” said co-author Dr Daniel Field from Cambridge’s Department of Earth Sciences. “Many early fossil penguins attained enormous sizes, easily dwarfing the largest penguins alive today. Our new species, Kumimanu fordycei, is the largest fossil penguin ever discovered—at approximately 350 pounds, it would have weighed more than [basketball player] Shaquille O’Neal at the peak of his dominance!”

The team named the new species Kumimanu fordycei in honour of Dr R. Ewan Fordyce, Professor Emeritus at the University of Otago. “Ewan Fordyce is a legend in our field, but also one of the most generous mentors I have ever known,” said first author Dr Daniel Ksepka from the Bruce Museum in Greenwich, Connecticut. “Without Ewan’s field programme, we wouldn’t even know that many iconic fossil species existed, so it is only right he have his own penguin namesake.”

Multiple specimens of a second penguin species were also found, providing a detailed view of the skeleton. Dubbed Petradyptes stonehousei, it weighed in at 50kg, smaller than Kumimanu fordycei but still well above the weight of an emperor penguin. The name combines the Greek ‘petra’ for rock and ‘dyptes’ for diver, a play on the diving bird being preserved in a boulder. ‘Stonehousei’ honours the late Dr Bernard Stonehouse (1926-2014), the first person to observe the full breeding cycle of the emperor penguin, a major milestone in penguin biology.

These two newly-described species show that penguins got very large early in their evolutionary history, millions of years before they fine-tuned their flipper apparatus. The team observed that the two species retained primitive features such as more slender flipper bones and muscle attachment points that resemble those of flying birds.

When asked why early penguins grew to titanic proportions, Ksepka speculated it made them more efficient in the water. “Size conveys many advantages,” he said. “A bigger penguin could capture larger prey, and more importantly it would have been better at conserving body temperature in cold waters. It is possible breaking the 100lb size barrier allowed the earliest penguins to spread from New Zealand to other parts of the world.”

“When we start thinking of these finds not as isolated bones but as parts of a whole living animal then a picture begins to form,” said co-author Dr Daniel Thomas from Massey University in Auckland. “Large, warm-blooded marine animals living today can dive to great depths. This raises questions about whether Kumimanu fordycei had an ecology that penguins today don’t have, by being able to reach deeper waters and find food that isn’t accessible to living penguins.”

“Kumimanu fordycei would have been an utterly astonishing sight on the beaches of New Zealand 57 million years ago, and the combination of its sheer size and the incomplete nature of its fossil remains makes it one of the most intriguing fossil birds ever found,” said Field, who is also the Curator of Ornithology at Cambridge’s Museum of Zoology. “Hopefully future fossil discoveries will shed more light on the biology of this amazing early penguin.”

The research was supported in part by the National Science Foundation, UK Research and Innovation (UKRI) and the Te Papa Collection Development Fund. Daniel Field is a Fellow of Christ’s College, Cambridge.

 Reference:
Daniel T. Ksepka et al. ‘Largest-known fossil penguin provides insight into the early evolution of sphenisciform body size and flipper anatomy.’ Journal of Paleontology (2023). DOI: 10.1017/jpa.2022.88

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With thanks to:
_{Bruce Museum
Massey University}

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_{The text in this work is licensed under a Creative Commons Attribution 4.0 International License}

A survey of over 2,000 British adults finds that trust in genetics is high and went up significantly during the pandemic. It also finds that there is a hunger for more coverage of genetics.

These results really challenge us to double our efforts. We need to rise to the new opportunity and the challenge created by the outcomes of this survey.Anne Ferguson-Smith

The pandemic has gone hand-in-hand with a much-increased public profile of science − genetics in particular. Be it the prominence of PCR testing or the development of vaccines, genetics has been in the spotlight in an unprecedented way. Given this, researchers from the Universities of Bath, Cambridge, Oxford, UCL, and Aberdeen wanted to know what the public felt about genetics and whether this new exposure of the science had made a difference.

The Genetics Society funded and commissioned a survey of over 2,000 randomly selected British adults through a public polling company Kantar Public. The researchers found that as a baseline most people were trusting of genetic technologies before the pandemic. Nearly half (45%) reported they trusted it to work for the societal good, 37% were neutral on this question, while 18% said they did not, and only very few (1-2%) were strongly distrusting.

When asked if their trust in genetics had gone up through the pandemic, four times more people said their trust had increased than those who reported that it had gone down. Trust in science more generally had strongly gone up with a third of people saying it had increased.

The results suggest that not only has trust in science gone up, but people want to hear more about it. Less than 10% thought that there was too much coverage of science in the media, while 44% reported that they want to hear more about it.

Anne Ferguson-Smith, Pro-Vice-Chancellor for Research and International Partnerships and Arthur Balfour Professor of Genetics at Cambridge University and President of the Genetics Society said: “These results really challenge us to double our efforts. We need to rise to the new opportunity and the challenge created by the outcomes of this survey”.

Co-lead Professor Laurence Hurst of the Milner Centre for Evolution at the University of Bath said: “this is potentially important to know – scientists have a tendency to stick in their labs, but it looks like, for the most part, the public not only trust us but that this trust has gone up somewhat and many want to hear more from us about our work.”

Professor Jonathan Pettitt, co-lead from the University of Aberdeen said: “It is hard to see any upsides to the pandemic but perhaps this is one? We never knew that so many people wanted to hear more from scientists.”

Co-lead Professor Alison Woollard of the Department of Biochemistry at the University of Oxford said: “We think we have established the limits of science communication. Despite all the talk of PCR over the last many months, we found that 30% hadn’t heard the term or knew it was a tool for testing for the virus. It is hard to see how any science can have more exposure than PCR has had. We need to be realistic and understand that, no matter what, we will never reach everyone. For informing people about things like vaccines this is important to know.”

Dr Adam Rutherford from the UCL department of Genetics, Evolution and Environment said: “We often hear that trust in science is at a low point, but what we found is that most people do trust the science of genetics as the basis of how we address global issues such as pandemics. However, scientists should not be complacent: we also found that the exposure of genetics during the pandemic made those suspicious of science more distrusting, despite the evidence. In a world where these voices can easily be amplified, we must be vigilant that our processes, methodologies and results are clearly and transparently communicated.”

Dr Cristina Fonseca, project coordinator for the Genetics Society, said “having a representative random survey is really vital and allows us insight into the true diversity of opinions.”

This article was adapted from a press release from the Genetics Society.

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Undernourished coastal communities in the tropics – where children’s growth can be stunted by a lack of micronutrients – can get the vitamins and minerals they need from sustainable small-scale octopus fisheries, say researchers.

Just a small serving of something very, very micronutrient rich, like octopus, can fill critical nutritional gaps.Dr David Willer, Department of Zoology

Research led by Cambridge scientists, and published in Nature Food, shows that tropical small-scale octopus fisheries offer a sustainable source of food and income to communities that face food insecurity, where the prevalence of undernourishment can exceed 40% and stunting in children under five commonly exceeds 30%. 

The high micronutrient density of octopus – including vitamin B12, copper, iron and selenium – means that human populations only need to eat a small quantity to supplement a diet primarily comprising staple plant crops. The new research shows that just a small amount of production in a tropical small-scale octopus fishery can deliver the micronutrient needs to a relatively large number of people.

The fast growth and adaptability of octopuses to environmental change can also facilitate sustainable production, and catch methods in the fisheries – primarily consisting of hand techniques, small-scale lines, pots and traps – are less environmentally harmful than those of large industrial fishing.

Dr David Willer, lead author, from the Department of Zoology at the University of Cambridge and a Fellow at Murray Edwards College, said: “Worldwide, nearly half of people’s calories come from just three crops – rice, wheat, and maize – which are high energy, but relatively low in key nutrients. Just a small serving of something very, very micronutrient rich, like octopus, can fill critical nutritional gaps. And, of course, if you get better nutrition as a child you’re much more physically and mentally prepared for later life, which can lead to better jobs, better employment and better social development.

“These small fisheries also provide an income and a livelihood, often to women whose economic status is enhanced as a result. Small-scale octopus fisheries revolve around local communities and potentially that gives them a greater resilience against market pressures and other disruptions to global food supply and trade.”

Small-scale fisheries, across all sectors, currently provide more than two-thirds of the fish and seafood destined for human consumption worldwide, and employ over 90% of fishers involved in capture fisheries. 47% of the workforce employed in these fisheries are women.

Based on a global review of data from global seafood databases and published literature, and written in partnership with science-led social enterprise Blue Ventures, the research found that in many cases tropical small-scale octopus fisheries are operating using relatively low impact techniques, and when combined with local and national management approaches can provide a more sustainable source of seafood. Successful approaches include periodic fishery closures, size restrictions, and licences. The need for knowledge transfer of fishing gears is also crucial so that the message on fish sustainability and securing the food supply and economic stability is spread widely. 
 

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We have a moral duty to allow others to make ‘transformative choices’ such as changing careers, migrating and having children, a new study argues. This duty can be outweighed by competing moral considerations such as preventing murder but in many cases we should interfere with far greater caution.

The ability to see that the person we’ve become is the product of decisions that we made for ourselves is very importantFarbod Akhlaghi

If you’ve told an adult friend or family member that they should not take a job, not date someone, not try skydiving or not move abroad, you may have violated a crucial moral right to ‘revelatory autonomy’ and ‘self-authorship’, according to a philosopher at Christ’s College, Cambridge.

Dr Farbod Akhlaghi’s study, published in the journal Analysis, is the first of its kind to suggest that we have a moral right to ‘revelatory autonomy’, that is the right to discover for ourselves who we’ll become as a result of making ‘transformative choices’, choices to have experiences that teach us what that experience will be like for us whilst also changing our core preferences, values and desires.

Dr Akhlaghi says: “The ability to see that the person we’ve become is the product of decisions that we made for ourselves is very important.

“I’m not telling people what to do. I’m just highlighting part of what is morally at stake in these very common interactions and trying to develop a framework for us to understand them. I hope some may find this helpful, as these will always be difficult moments for all of us.”

Traditionally, philosophers interested in ‘transformative experiences’ have focused on the decision-maker not on the people who are in a position to influence that person’s choices. But Dr Akhlaghi thinks that these neglected interactions present ‘an urgent ethical challenge’:

“There are lots of different reasons why we might seek to intervene – some selfish, others well meaning – but whatever our motivation, we can cause significant harm, including to the people we love most.”

While Akhlaghi accepts that advice can be offered without crossing the moral line, he warns that it is all too easy to slip into various forms of interference, such as forcing, coercing, manipulating or even ‘rationally persuading’ someone away from a transformative choice, in ways that may violate their right to revelatory autonomy.

Akhlaghi says: “Rational persuasion is probably the most common form of interference. Giving, when asked, factual information about a choice that you have knowledge about and the other person does not, can be justified. But while rational persuasion respects someone’s ability to reason, even this form of engagement can involve disrespecting their autonomous self-authorship.

For example, Akhlaghi continues: “Offering reasons, arguments or evidence as if one is in a privileged position with respect to what the other person’s experience would be like for them disrespects their moral right to revelatory autonomy.”

Initially inspired to consider this area of moral philosophy by personal experiences, Dr Akhlaghi examines and rejects a number of other conditions under which it could be argued that trying to prevent someone from making transformative choices is morally justified.

For example

Dissuading someone from becoming a parent because you think parenthood would make their life worse is problematic because becoming a parent is a positive experience for some and not for others, and no one can know that outcome in advance, even if the person doing the dissuading has experienced being a parent themselves.

A different example in the study relates to dissuading someone from making a career change that involves a big pay cut because you think that they would struggle to afford their expensive tastes. This is just as problematic, Akhlaghi says, because:

“We can only know what the future person’s interests are and whether their present interests will be fulfilled after a transformative choice has been made.”

“The person who changes job might manage to afford their expensive tastes and we don’t even know if that future person would still have these tastes. This highlights another problem – whose interests matter morally when trying to justify interfering: those of the present or the future person?”

Is it ever right to interfere?

“It is only permissible to interfere to try to prevent a transformative choice,” Akhlaghi argues “if someone’s right to revelatory autonomy is outweighed by competing moral considerations.”

A would-be killer’s right to revelatory autonomy is, for instance, plausibly outweighed by the wrongness of killing others solely to discover who they would become by doing so. Equally, protecting a friend from gratuitous self-mutilation would plausibly outweigh their right to autonomously discover what it would be like to harm themselves in this way.

Akhlaghi suggests that the more likely it is that a choice will affect someone’s ‘core preferences, identity and values’, the stronger the moral reasons would need to be to justify interfering in their decision. For instance, interfering in someone’s decision to go to university or not, would require far stronger moral reasons than them choosing whether to eat a cheeseburger or not.

Finally, Akhlaghi clarifies that his study concerns voluntary choices to have ‘transformative experiences.’ Some such experiences are instead either the unintended consequences of something we did, or ones we are forced into as, for example, children might be by a divorce. These raise different but related problems he hopes to explore in future work.

Reference

Farbod Akhlaghi, ‘Transformative experience and the right to revelatory autonomy‘, Analysis (2022), DOI: 10.1093/analys/anac084

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The introduction of the soft drinks industry levy – the ‘sugary drinks tax’ – in England was followed by a drop in the number of cases of obesity among older primary school children, according to Cambridge researchers. Taking into account current trends in obesity, their estimates suggest that around 5,000 cases of obesity per year may have been prevented in year six girls alone.

We urgently need to find ways to tackle the increasing numbers of children living with obesity, otherwise we risk our children growing up to face significant health problems. That was one reason why the UK’s soft drinks industry levy was introduced, and the evidence so far is promisingNina Rogers

The study, published today in PLOS Medicine, looked at the impact of the levy on reception age children and those in year six, but found no significant association between the levy and obesity levels in year six boys or younger children from reception class.

The research was supported by the National Institute of Health and Care Research (NIHR) and the Medical Research Council.

Obesity has become a global public health problem. In England, one in ten reception age children (four to five years old) is living with obesity and this figure doubles to one in five children in year six (10 to 11 years). Children who are obese are more likely to suffer from serious health problems including high blood pressure, type II diabetes and depression in childhood and in later life.

In the UK, young people consume significantly more added sugars than is recommended – by late adolescence, they typically consume 70g of added sugar per day, more than double the recommended amount (30g). A large source of this is sugar-sweetened drinks. Children from deprived households are more likely to be at risk of obesity and to be heavy consumers of sugar-sweetened drinks.

In April 2018, to protect children from excessive sugar consumption and tackle childhood obesity, the UK governments introduced a two-tier sugar tax on soft drinks – the soft drinks industry levy. The tax was targeted at manufacturers of the drinks to incentivise them to reduce the sugar content of soft drinks.

Researchers from the Medical Research Council (MRC) Epidemiology Unit at the University of Cambridge tracked changes in the levels of obesity in children in England in reception year and year six between 2014 and 2020. Taking account of previous trends in obesity levels, they compared changes in levels of obesity 19 months after the sugar tax came into effect.

The team found that the introduction of the sugar tax was associated with an 8% relative reduction* in obesity levels in year six girls, equivalent to preventing 5,234 cases of obesity per year in this group alone. Reductions were greatest in girls whose schools were in deprived areas, where children are known to consume the largest amount of sugary drinks – those living in the most deprived areas saw a 9% reduction.

However, the team found no associations between the sugar tax coming into effect and changes in obesity levels in children from reception class. In year 6 boys, there was no overall change in obesity prevalence.

Dr Nina Rogers from the MRC Epidemiology Unit at Cambridge, the study’s first author, said: “We urgently need to find ways to tackle the increasing numbers of children living with obesity, otherwise we risk our children growing up to face significant health problems. That was one reason why the UK’s soft drinks industry levy was introduced, and the evidence so far is promising. We’ve shown for the first time that it is likely to have helped prevent thousands of children each year becoming obese.

“It isn’t a straightforward picture, though, as it was mainly older girls who benefited. But the fact that we saw the biggest difference among girls from areas of high deprivation is important and is a step towards reducing the health inequalities they face.”

Although the researchers found an association rather than a causal link, this study adds to previous findings that the levy was associated with a substantial reduction in the amount of sugar in soft drinks.

Senior author Professor Jean Adams from the MRC Epidemiology Unit said: “We know that consuming too many sugary drinks contributes to obesity and that the UK soft drinks levy led to a drop in the amount of sugar in soft drinks available in the UK, so it makes sense that we also see a drop in cases of obesity, although we only found this in girls. Children from more deprived backgrounds tend to consume the largest amount of sugary drinks, and it was among girls in this group that we saw the biggest change.”

There are several reasons why the sugar tax did not lead to changes in levels of obesity among the younger children, they say. Very young children consume fewer sugar-sweetened drinks than older children, so the soft drinks levy would have had a smaller effect. Similarly, fruit juices are not included in the levy, but contribute similar amounts of sugar in young children’s diets as sugar-sweetened beverages.

It’s unclear why the sugar tax might affect obesity prevalence in girls and boys differently, however, especially since boys are higher consumers of sugar-sweetened beverages. One explanation the researchers put forward is the possible impact of advertising – numerous studies have found that boys are often exposed to more food advertising content than girls, both through higher levels of TV viewing and in how adverts are framed. Physical activity is often used to promote junk food and boys, compared to girls, have been shown to be more likely to believe that energy dense junk foods depicted in adverts will boost physical performance and so are more likely to choose energy-dense, nutrient-poor products following celebrity endorsements.

The study was a collaboration involving researchers from the University of Cambridge, London School of Hygiene and Tropical Medicine, University of Oxford, Great Ormond Street Institute of Child Health and University of Bath.

*A relative reduction is the difference between the expected incidence of obesity had the sugar tax not been introduced and the actual incidence.

Reference
Rogers, NT et al. Associations between trajectories of obesity prevalence in English primary school children and the UK soft drink industry levy: an interrupted time series analysis of surveillance data. PLOS Med; 26 Jan 2023; DOI: 10.1371/journal.pmed.1004160

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Dara McAnulty is an award-winning author and environmental campaigner. This month he was awarded a BEM for services to nature and the autistic community.

I’ve always loved the natural world and wanted to understand how it works. This is intertwined with my love of science, which I’ve based a lot of my writing on, and is the main driver for everything I do in life.

I study Natural Sciences. The course allows students to pick a mixture of modules from physics, chemistry or biology. The flexibility is good for me because I’ve always struggled to choose exactly what I want to do.

The workload is intense – there’s a lot of time when you’re in lectures, supervisions or the lab – but I like that because I enjoy doing lots of work. It’s a massive jump up from school where I barely needed to study to understand anything. Here you have to put in the effort.

I didn’t expect to get into Cambridge. But I was getting decent grades, so I picked it as the top option. I also thought I’d be bored at other universities if I wasn’t needing to work as hard as I do here – I wouldn’t know what to do with myself if I had a lot of free time.

There’s something in the air at Cambridge. There’s this massive number of smart people who are making a huge difference in the world. They are using what they’re learning to do so much cool stuff. It’s inspiring.

You fall into these strange and wonderful conversations that you just wouldn’t have anywhere else. You realise that although we’re all studying different courses they interlink in unexpected ways. You find that your expertise can help another person in a completely different field.

I’m only just starting my second term but there’s been so many highlights so far. One of my favourite moments was rowing in the Fairbairn Cup, a boat race on the Cam organised by Jesus College. Another was meeting up with Robert Macfarlane (a massively respected nature writer and a member of the English Faculty here) and finding a jay feather together. And then just being taught by incredible people who are so knowledgeable about their subject areas and not afraid to go into unusual concepts and ideas that I’ve never been exposed to before.

I grew up at the foot of the Mourne Mountains in County Down, Northern Ireland, and I feel as close to nature as I do to my heartbeat. I was diagnosed with autism when I was five and I started writing the Diary of a Young Naturalist when I was 14. It expresses how I feel about the quiet places of the countryside, my days and moments with wildlife.

I’ve had a wee bit of a chance to explore the countryside around Cambridge. I’ve been to the Grantchester Fens and Paradise Nature Reserve which are both lovely. On the way to the Botanic Gardens – where there’s an almost-sad-looking-stream – I saw a beautiful kingfisher which made my week.

My favourite spot in Cambridge is the Reaches. As you’re coming up the river the boathouses disappear, then the buildings and suddenly you’re out in the Fens and can see for ages and ages. Because we get up ridiculously early to row, the sun is rising and it’s so beautiful.

I find the lack of hills disturbing – I think Robert Macfarlane put it quite well when he referred to ‘horizontigo’. We both love mountains. I’ve grown up by them the whole of my life so it’s very strange to go out in the countryside and see nothing for tens of miles until the horizon.

I think I’d probably go insane if I lived right in the centre of Cambridge but at Queens’ I can be out in the Fens or parkland in five minutes. Its location is partly why I choose it. I also like that it’s a medium sized College.

Settling in went smoothly. Queens’ makes sure that everyone is feeling welcome and is really good when it comes to mental health. It also helps that Queens’ is just a five-minute walk away from everything.

I do miss my family a lot when I’m away. But the good thing about Cambridge is that I don’t have enough time to feel homesick because it keeps you rushing about. It’s important to get that bit of independence and learn how to function properly as a human in the world. I’ll just take every day as it comes and keep going one step at a time.

I’ve learnt that if you’re feeling a little bit down, sometimes getting outside can really help. Trying to make a bit of time to have those quiet moments when you can piece together all the things that are going on helps to settle the mind. It’s easy to get into the mindset of: “I’m alone; I have to get through this by myself” but no, you don’t need to do that, instead go and talk to someone because in fact people genuinely do care.

From my personal experience I’d also say – and this is going to sound so clichéd – when people tell you that you can’t do something – have a go anyway. Even if it doesn’t work out at least you gave it a try. We only get a certain amount of time in our lives, and we’ve got to try to make every little thing count.

Being named on the New Year Honours list felt bizarre. When I first saw the email I thought it was a scam. But no, it was in fact real. I’ve not entirely processed it yet, but it was incredible.

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Published 30 January 2023
With thanks to:

_{Dara McAnulty}

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_{Words:
Charis Goodyear}

_{Photography:
Lloyd Mann}

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_{The text in this work is licensed under a Creative Commons Attribution 4.0 International License}

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