Eastman Chemical went a step beyond calling Tritan plastic BPA-free, setting off a legal challenge. Eastman hide caption

itoggle caption Eastman

By measuring activity in different parts of the brain, neuroscientsts can get a sense of how some people will respond to treatments. John Lund/Getty Images hide caption

itoggle caption John Lund/Getty Images

Barotrauma can cause a fish's eyes to pop out of its head and its stomach to be pushed out of its mouth, according to Chris Lowe, a marine scientist at California State, Long Beach. Jon Hamilton/NPR hide caption

itoggle caption Jon Hamilton/NPR

Katie Clapp shares a laugh with her son Andy Tranfaglia, 25, at their home in West Newbury, Mass. Andy has a rare genetic condition called fragile X syndrome. Ellen Webber for NPR hide caption

itoggle caption Ellen Webber for NPR

Bob Smithson, 79, can now hold his head upright and breathe on his own, thanks to a medication for myasthenia gravis. M. Scott Brauer for NPR hide caption

itoggle caption M. Scott Brauer for NPR

By increasing the amount of serotonin in the spinal cord, an experimental drug helps nerve connections work better. Bee Smith/Ocean/Corbis hide caption

itoggle caption Bee Smith/Ocean/Corbis

In sighted people, the part of the brain that recognizes faces is linked to the brain's visual system. But in blind people it seems wired to circuits that process sound. Tina Zellmer/Ikon Images/Corbis hide caption

itoggle caption Tina Zellmer/Ikon Images/Corbis