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It’s hard not to be awed by nature’s big predators, but learning more about megalodons – giant sharks that prowled the oceans millions of years ago and were three times the size of today’s great whites – can take that fascination to the next level. Three researchers who analyze the chemistry of fossils – in this case, hand-size megalodon teeth – explain how they have gotten clues about this creature’s diet and perhaps how it died out. Also, don’t miss the story on how hammerhead sharks evolved to have their crazy-shaped heads.
One of our most-read stories from the past week examined food expiration dates and the lack of any science behind most of them. University of South Florida public health researcher and microbiologist Jill Roberts explains how various labels can be generated, describes how science-based approaches differ and offers some advice: “In the absence of a uniform food dating system, consumers could rely on their eyes and noses, deciding to discard the fuzzy bread, green cheese or off-smelling bag of salad.”
University of Michigan biomedical scientist Ashu Tripathi offers a compelling case for focusing more research on natural compounds that can be used in drugs, including much-needed antibiotics. He notes that roughly 75% of antibiotics are derived from nature, but finding naturally occurring compounds that fight microbes comes with some challenges, which have contributed to this practice’s falling out of favor since the 1980s. “I believe that undiscovered treatments for a wide range of diseases are lying right under our noses in natural products,” he writes.
Also in this week’s science news:
If there’s a subject you’d like our team of science editors to investigate, please reply to this email.
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Martin La Monica
Director of Editorial Projects and Newsletters
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Megalodon would have dwarfed today’s great white sharks.
Christina Spence Morgan
Emma Kast, University of Cambridge; Jeremy McCormack, Goethe University Frankfurt am Main; Sora Kim, University of California, Merced
Megalodon, the world’s largest known shark species, swam the oceans long before humans existed. Its teeth are all that’s left, and they tell a story of an apex predator that vanished.
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Without obvious signs of contamination like the mold in this jam, consumers use expiration dates to decide whether to keep or throw away food.
Ralf Geithe via iStock/Getty Images
Jill Roberts, University of South Florida
Current expiration date system leads to confused consumers and wasted food.
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Around 75% of antibiotics, including penicillin and amphotericin B, are derived from natural products.
Aphiwat Chuangchoem/EyeEm via Getty Images
Ashu Tripathi, University of Michigan
With the dual threats of antibiotic resistance and emerging pandemics, finding new drugs becomes even more urgent. A trove of medicines may be lying under our nose.
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Paul S. Rosenbloom, University of Southern California; Christian Lebiere, Carnegie Mellon University; John E. Laird, University of Michigan
To build a true artificial mind, first map out how thinking works. Enter the Common Model of Cognition.
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Jason McLachlan, University of Notre Dame
A few tree species, including American beech and eastern hemlock, were responsible for the bulk of carbon storage.
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Idan Ginsburg, Georgia State University
Astronomers have discovered the first dormant black hole outside of the Milky Way. These black holes are not absorbing matter from a nearby star, making them incredibly hard to find.
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Gavin Naylor, University of Florida
The first hammerhead shark was likely the result of a genetic deformity. A biologist explains how shark DNA reveals hammerheads’ history.
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Kathryn H. Jacobsen, University of Richmond
By late July 2022, monkeypox was present in more than 70 countries with significant spread in certain communities. As a result, the World Health Organization began taking steps to fight the virus.
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Suresh V. Kuchipudi, Penn State
Face masks are still an effective way to help stop the spread of the BA.5 subvariant.
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Iain Boyd, University of Colorado Boulder
Build a powerful enough laser, and you can shine it into space. Aim it well, and you can blind satellites.
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Wendy Whitman Cobb, Air University
The head of the Russian space agency announced that the country will withdraw from the International Space Station after 2024. A space policy expert explains what this means and why it’s happening now.
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