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Daily briefing: What a healthy, sustainable diet looks like
NATURE BRIEFING . 02 December 2021 . Daily briefing: What a healthy, sustainable diet looks like . What humanity should eat to stay healthy and save the planet. Plus, the world commits to a pandemic response pact and variations in Earth’s orbit influence phytoplankton evolution. Flora Graham . Flora Graham View author publications You can also search for this author in PubMed ? Google Scholar Twitter . Facebook . Email . Sign up for Nature Briefing You have full access to this article via your institution. Download PDF Hello Nature readers, would you like to get this Briefing in your inbox free every day? Sign up here. Knot theorists proved the validity of a mathematical formula about knots after using machine learning to guess what the formula should be. Credit: DeepMind DeepMind’s AI untangles knots . Artificial-intelligence (AI) powerhouse DeepMind has teamed up with mathematicians to spot previously unseen patterns and seek new discoveries. Researchers trained a machine-learning algorithm on vast amounts of data about knots and revealed a formula linking two properties of knots — which the mathematicians then proved rigorously. In a separate test, the team found a potential pattern related to symmetries, which had been sought for decades. “I was very struck at just how useful the machine-learning tools could be as a guide for intuition,” says knot theorist Marc Lackenby. Nature 6 min read Reference: Nature paper World commits to a pandemic response pact . This week, world leaders met to negotiate how to ensure that a crisis on the scale of the COVID-19 pandemic never happens again. Initially on the table was a legally binding pandemic treaty that would dictate how nations should respond to future outbreaks. A fuzzier form of that proposal is now moving forward, to be sharpened in the months and years to come . Nature explains the negotiations and the prospects for revamping global cooperation. Nature 7 min read Maddox Prize rewards science under fire . Science-integrity advocate Elisabeth Bik has won this year’s John Maddox Prize, given by the charity Sense About Science and Nature , for advancing science and evidence in the face of difficulty or hostility. Physician-scientist Mohammad Sharif Razai won the early-career prize for his work on publicising an evidence-based understanding of racial health inequalities. In his speech, Razai — who sought asylum in the United Kingdom at age 15 — paid tribute to family members who had just fled Afghanistan. “No matter what obstacles and challenges we may face as scientists in the global north, it is not the same as Afghan scientists, especially women and those from racial minorities, who literally pay with their lives in speaking truth and standing up for their rights,” he said. “I remember them and dedicate this prize to them.” Research Professional News 3 min read Features & opinion . What a healthy, sustainable diet looks like . As the world population continues to rise, researchers are grappling with the question of what we should eat to stay healthy and save the planet. A 2019 report from a consortium of nutritionists, ecologists and other experts recommended that people adopt a ‘flexitarian’ diet by eating plants on most days and occasionally a small amount of meat or fish. The commission estimates that this diet would save the lives of about 11 million people every year, but others question whether it is practical, affordable and nutritious enough. Scientists are now trying to test environmentally sustainable diets in local contexts , without compromising nutrition or damaging livelihoods. Nature 11 min read Reference: EAT– Lancet Commission report Geoengineering research should be global . Injecting aerosol sulfates into Earth’s stratosphere is the fastest known solar-geoengineering technique for cooling the planet, and it’s comparatively inexpensive. So it is crucial to improve our murky understanding of its consequences , says climate scientist Kate Ricke. The involvement of scientists worldwide is crucial before some entity is tempted to use the technique, she argues. “I'm having a hard time seeing how we’re not going to do it at this point, actually,” says Ricke. “But in order to have collective decision-making at the global scale, you need science that's viewed as legitimate by everyone.” Wired 10 min read News & views . Figure 1 Coccolithophores. These marine phytoplankton make intricate oval structures intracellularly — called coccoliths — that are then extruded to surround the organism’s surface (the species shown is Emiliania huxleyi ). Beaufort et al. analysed coccoliths in ancient marine sediments, and their findings indicate that eccentricity in Earth’s orbit had a role in shaping phytoplankton evolution. Credit: Steve Gschmeissner/Science Photo Library Plankton evolution follows Earth’s orbit . Variations in Earth’s orbit might help to determine the evolution of marine phytoplankton. Researchers analysed fossils of coccolithophores that lived in the Pleistocene period (from 2.6 million to 11,700 years ago) alongside deviations in the circularity of Earth’s annual orbit, which cycles approximately every 100,000 and 400,000 years. They found that the diversity of plankton species increased during periods of high eccentricity of Earth’s orbit , when the seasons vary more in equatorial regions. Because the calcium carbonate skeletons of phytoplankton make a significant contribution to our planet’s carbon cycle, “such a link between orbital change, climate and phytoplankton evolution could be an intrinsic beat that underscores the Earth system”, writes biogeochemist Rosalind Rickaby. Nature 8 min read (Nature paywall) & Sky News 2 min read (free) This News & Views article is exclusively available to readers with subscriber access to Nature . Click here for help getting logged in with your institution’s subscription . Reference: Nature paper Quote of the day . “Isaac Newton said that scientists see further by standing on the shoulders of giants. So it’s vital to know whose shoulders we can trust. And we should definitely avoid giants whose shoulders have been photoshopped.” . In her acceptance speech for the John Maddox Prize, science-integrity advocate Elisabeth Bik called for journals to do more to deal with problematic papers. ( The Guardian 5 min read )Read more: Meet this super-spotter of duplicated images in science papers (Nature 15 min read) doi: https://doi.org/10.1038/d41586-021-03639-4 This newsletter is always evolving — tell us what you think! Please send your feedback to briefing@nature.com . Flora Graham, senior editor, Nature Briefing With contributions by Smriti Mallapaty, Anne Marie Conlon, Davide Castelvecchi and Anna Nowogrodzki. Related Articles . Daily briefing: Omicron was already spreading in Europe . Daily briefing: Multicellular living robots build their own offspring . Daily briefing: What happened to the ‘CRISPR babies’? . Daily briefing: Omicron coronavirus variant puts scientists on alert . . Jobs . Associate/Senior Editor, Nature Reviews Materials . Springer Nature London, Greater London, United Kingdom Tenure Track Scientist . Woods Hole Oceanographic Institution (WHOI) Woods Hole, United States Postdoctoral fellowship . University of Gothenburg (GU) G?teborg, Sweden Director of Strategy and Planning . Medical Research Council Multiple locations .
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