The good old reflex hammer (like this Taylor model) might seem like an outdated medical device, but its role in diagnosing disease is still as important as ever. Meredith Rizzo/NPR hide caption

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Meredith Rizzo/NPR

U.K.'s Anti-Terrorism Programs Under Scrutiny

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After A Terrorist Attack, Social Media Can Cause More Harm Than Good

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Ke Jie, the world's No. 1 Go player, stares at the board during his second match against AlphaGo in Wuzhen, China, on Thursday. The 19-year-old grandmaster dropped the match in the best-of-three series against Google's artificial intelligence program. AFP/Getty Images hide caption

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AFP/Getty Images

Computer Wins Again In Chinese Game Of Go

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Researchers had participants wear the fitness trackers while walking or running on a treadmill and while riding an exercise bike to determine how well the trackers measured heart rate and energy expenditure. Paul Sakuma/Courtesy of Stanford University School of Medicine hide caption

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Paul Sakuma/Courtesy of Stanford University School of Medicine

Fitness Trackers: Good at Measuring Heart Rate, Not So Good At Measuring Calories

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Spectators watch the world's top-ranked Go player, Ke Jie, square off against Google's artificial intelligence program, AlphaGo, during the Future of Go Summit in Wuzhen, China, on Tuesday. The program beat Ke in the first of three planned matches. Peng Peng/AP hide caption

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Peng Peng/AP

David Giovannoni uses a reproduction of Scott's phonautograph. Giovannoni is part of the team that recovered the audio from Scott's recordings. Art Silverman/NPR hide caption

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Art Silverman/NPR

At The Dawn Of Recorded Sound, No One Cared

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While the government dodged a bullet this time by avoiding the latest malware attack, experts say its systems are still vulnerable. Intrepid00/Flickr hide caption

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Intrepid00/Flickr

Federal Computers Dodge Global Malware Attack ... This Time

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John Goodenough's work led to the lithium-ion battery, now found in everything from phones to electric cars. He and fellow researchers at the University of Texas, Austin say they've come up with a faster-charging alternative. Gabriel Cristóver Pérez/KUT hide caption

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Gabriel Cristóver Pérez/KUT

At 94, Lithium-Ion Pioneer Eyes A New Longer-Lasting Battery

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The Gab.ai home page cites the First Amendment of the U.S. Constitution. Gab.ai/Screenshot by NPR hide caption

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Gab.ai/Screenshot by NPR

Feeling Sidelined By Mainstream Social Media, Far-Right Users Jump To Gab

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