Answer these 10 simple questions to find out if you benefit from being highly agreeable
Learn about the bacteria, fungi and other micro-organisms that maintain human health.
From the great ocean liner's construction to its sinking to its discovery on the ocean floor, the key moments in the Titanic's history. See our full centenary coverage here
Challenge your ability to juggle mental tasks with this interactive feature
Thirty years of struggle and research have led to dozens of treatments for HIV/AIDS--although both a cure and an effective vaccine remain elusive
A look back at Japan's nuclear crisis, initiated by a magnitude 9.0 earthquake on March 11, 2011
Visit the places that help us sense other people's feelings in this Scientific American Mind tour of the brain