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Diazepam, also known as Valium, is used to treat anxiety and insomnia. But when combined with opioids, it can suppress breathing and cause death. Universal Images Group/Getty Images hide caption

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Universal Images Group/Getty Images

Experimental drugs that clear clumps of proteins from the brains of Alzheimer's patients haven't panned out yet. Science Photo Library/Pasieka/Getty Images hide caption

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Science Photo Library/Pasieka/Getty Images

Test Of Experimental Alzheimer's Drug Finds Progress Against Brain Plaques

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Chris Bettinger poses for a portrait with the edible battery his team designed at Carnegie Mellon University. Stephanie Strasburg/Tribune-Review hide caption

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Stephanie Strasburg/Tribune-Review

It took a team of delighted friends and family to help Florida engineer Matt Bellina (center) get back on his surfboard this summer after his severe spinal injury. The result? "I feel like I'm home," Bellina said. Courtesy of Diane Wehrell-Grabowski hide caption

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Courtesy of Diane Wehrell-Grabowski

Amanda McMacken, a registered nurse at Temple University Hospital, shows North Philadelphia residents how to slow bleeding in trauma victims. Kimberly Paynter/WHYY hide caption

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Kimberly Paynter/WHYY

In Philadelphia, Neighbors Learn How To Keep Shooting Victims Alive

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What did she say? Eniko Kubinyi/Science hide caption

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Eniko Kubinyi/Science

Their Masters' Voices: Dogs Understand Tone And Meaning Of Words

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After a Cologuard screening test for colon cancer comes back positive, patients may have to pay for additional diagnostic tests. Exact Sciences hide caption

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Exact Sciences

Bacteriophages, in red, look like tiny aliens, with big heads and skinny bodies. They use their "legs" to stick to and infect a bacterial cell, in blue. Biophoto Associates/Science Source hide caption

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Biophoto Associates/Science Source

Your Gut's Gone Viral, And That Might Be Good For Your Health

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Displaced women at the Muna informal settlement outside Maiduguri. They're among more than 2 million people driven from their homes by Boko Haram attacks during northeastern Nigeria's 7-year insurgency. Ofeibea Quist Arcton/NPR hide caption

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Ofeibea Quist Arcton/NPR

Mylan, the maker of EpiPen, says it will sell a generic version for $300 for a two-pack, a price that consumer advocates say is still too high. The device is used to treat severe allergic reactions. Daniel Acker/Bloomberg via Getty Images hide caption

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Daniel Acker/Bloomberg via Getty Images

Maker Of EpiPen To Sell Generic Version For Half The Price

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Careful audits of a representative sampling of bills from 37 Medicare Advantage Programs in 2007 have revealed some consistent patterns in the way they overbill, a Center for Public Integrity investigation finds. Nick Shepherd/Ikon Images/Getty Images hide caption

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Nick Shepherd/Ikon Images/Getty Images