The Odon Device was inspired by a YouTube video about how to remove a cork from the inside of a wine bottle. The Odon Device hide caption

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Children under age 2 can reason abstractly, researchers say. Jandrie Lombard/iStock hide caption

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Illustration by Daniel Horowitz for NPR

A child wearing the traditional eyeliner kajal peeps from behind a door in Allahabad, India. Rajesh Kumar Singh/AP hide caption

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Researchers stroked babies' faces with a paintbrush while they watched the same thing happening to a baby in a video. How long the babies in the experiment watched the screen gave clues to what they were thinking. Courtesy of Maria Laura Filippetti hide caption

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A screenshot of the iPad game If, which aims to teach kids how to navigate interpersonal challenges and failures. NPR hide caption

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There's a reason she's out there all alone. Children worldwide are spending less time on sports and active play and more time with TVs and video games. hide caption

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Public school student Julio Valenzuela, 11, grimaces as he gets a vaccination before the start of the school in Lynnwood, Calif., on Aug. 27. Vaccines are required for school attendance. ROBYN BECK/AFP/Getty Images hide caption

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Tina Nevill of Essex, England, holds Poppy, who was conceived by in vitro fertilization. The U.K.'s health system records all IVF cycles performed in the country. Barcroft Media/Landov hide caption

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He's not just getting a cold. He's building his microbiome. hide caption

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Girls are particularly vulnerable to brain changes caused by stress or trauma, researchers say. Allen Johnson/ hide caption

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