Andie Vaught grasps a stress toy in the shape of a truck as she prepares to have blood drawn as part of a clinical trial for a Zika vaccine at the National Institutes of Health in Bethesda, Md., in November 2016. Allison Shelley/The Washington Post/Getty Images hide caption

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The Trump administration has reversed federal guidance that directed public schools to allow students to use the restrooms and locker rooms that corresponded to their gender identities. Sara D. Davis/Getty Images hide caption

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A Planned Parenthood sign in Dallas. A federal judge has temporarily blocked an attempt by Texas officials that would have removed Medicaid funds from Planned Parenthood clinics in the state. LM Otero/AP hide caption

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Several new studies show mixed results for men taking testosterone supplements. Garo/Phanie/Passage/Getty Images hide caption

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Does Testosterone Improve Older Men's Health? It Depends

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Each year thousands of people from around the world tour the Gomantong Cave in Borneo. Although scientists have found a potentially dangerous virus in bats that roost in the cave, no one has ever gotten sick from a trip here. Razis Nasri hide caption

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Razis Nasri

The Next Pandemic Could Be Dripping On Your Head

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Can Poetry Keep You Young? Science Is Still Out, But The Heart Says Yes

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Got Back Pain? Try Yoga Or Massage Before Reaching For The Pills

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Rep. William "Bill" Huizenga, R-Mich., says House Republicans "know the direction we want to go and sort of the destination" with replacing Obamacare. Andrew Harrer/Bloomberg via Getty Images hide caption

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Republican Health Care Proposal Would Cover Fewer Low-Income Families

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Brown recluse spiders are indeed reclusive, so bites are more apt to happen in places like closets or attics. Rosa Pineda/Smithsonian National Museum of Natural History/Flickr hide caption

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The National Academies of Science, Engineering and Medicine recommends that most adults get about 600 international units of vitamin D per day through food or supplements, increasing that dose to 800 IUs per day for those 70 or older. essgee51/Flickr hide caption

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A Bit More Vitamin D Might Help Prevent Colds And Flu

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Biotechnologist Feng Zhang of the Broad Institute (a joint venture of MIT and Harvard University) was awarded a patent for CRISPR gene-editing technology in 2014. But two other scientists — Jennifer Doudna, of the University of California, Berkeley, and Emmanuelle Charpentier, then of the University of Vienna — published their description of the underlying biology first. Susan Walsh/AP hide caption

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Susan Walsh/AP

Broad Institute Wins Big Battle Over CRISPR Gene-Editing Patent

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"Sell by" and "expiration" labels on food products may contribute to food waste by misleading consumers to throwing away perfectly good food. Now, two food industry associations are encouraging food companies to do away with these labels. Ryan Eskalis/NPR hide caption

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Uncertainty about the future can raise stress levels, psychologists say. Here, students in Charlotte, N.C., hold hands during a Sept. 21 protest after Keith Lamont Scott was shot and killed by a police officer. Nicholas Kamm/AFP/Getty Images hide caption

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