Vitamin E has been associated with increased risk of death in some studies, but it may also delay cognitive decline in Alzheimer's disease. iStockphoto hide caption

itoggle caption iStockphoto

People drew maps of body locations where they feel basic emotions (top row) and more complex ones (bottom row). Hot colors show regions that people say are stimulated during the emotion. Cool colors indicate deactivated areas. Image courtesy of Lauri Nummenmaa, Enrico Glerean, Riitta Hari, and Jari Hietanen. hide caption

itoggle caption Image courtesy of Lauri Nummenmaa, Enrico Glerean, Riitta Hari, and Jari Hietanen.

Researchers have only recently been able to use brain scans to detect Alzheimer's risk factors in living people. iStockphoto hide caption

itoggle caption iStockphoto

Having a perfect memory can put a strain on relationships, because every slight is remembered. Katherine Streeter for NPR hide caption

itoggle caption Katherine Streeter for NPR

There's data to support the notion that pot, or a drug based on its active ingredient, could help ease the fears of PTSD. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP
Screenshot Courtesy of WSJDigitalNetwork

Avielle's artwork hangs on the walls and windows of Jeremy Richman and Jennifer Hensel's home. Craig Ruttle/AP hide caption

itoggle caption Craig Ruttle/AP

Dartmouth defenders sandwich a New Hampshire wide receiver during a game in Durham, N.H., in 2009. Josh Gibney/AP hide caption

itoggle caption Josh Gibney/AP

Michael Hartnett was a Marine during the Gulf War and served in Somalia. He received a bad conduct discharge for abusing drugs and alcohol. His wife, Molly, helped him turn his life around. Quil Lawrence/NPR hide caption

itoggle caption Quil Lawrence/NPR

Surgeons use a grid of electrodes laid on a patient's brain. They record electrical activity and can deliver a tiny jolt. Courtesy of Dr. Josef Parvizi hide caption

itoggle caption Courtesy of Dr. Josef Parvizi