Fifty years ago, the typical first-time mother in the U.S. took about four hours to give birth. These days, women labor about 6 1/2 hours. Carsten/Three Lions/Getty Images hide caption

toggle caption Carsten/Three Lions/Getty Images

Environmental groups say a ban would protect consumers from the health effects of BPA that leaches from products including some soup cans. Chip Somodevilla/Getty Images hide caption

toggle caption Chip Somodevilla/Getty Images

A package of K2, a concoction of dried herbs sprayed with chemicals sometimes called synthetic marijuana. New York moved to ban a wide range of products like these this week. Kelley McCall/AP hide caption

toggle caption Kelley McCall/AP

This image shows the grid structure of the major pathways of the brain. It was created using a scanner that's part of the Human Connectome Project, a five-year effort which is studying and mapping the human brain. MGH-UCLA Human Connectome Project hide caption

toggle caption MGH-UCLA Human Connectome Project

Aspirin helps reduce the risk of cardiovascular disease, but the jury's still out on cancer. hide caption

toggle caption

NPR thanks our sponsors

Become an NPR sponsor