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

itoggle caption The Odon Device

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

itoggle caption Jandrie Lombard/iStock

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

itoggle caption Rajesh Kumar Singh/AP

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

itoggle caption Courtesy of Maria Laura Filippetti

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

itoggle caption NPR

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. iStockphoto.com hide caption

itoggle caption iStockphoto.com

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

itoggle caption ROBYN BECK/AFP/Getty Images

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

itoggle caption Barcroft Media/Landov

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

itoggle caption iStockphoto.com

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

itoggle caption Allen Johnson/iStockphoto.com