Scientific American Magazine

Far from being a nagging exception to the rule of evolution, cooperation has been one of its primary architects

A rare group of HIV-positive individuals need no medicine to keep the virus in check. Their good fortune could point the way to more powerful treatments--and perhaps a vaccine

Nimble robots like this Cheetah will help the military navigate terrain too rocky for wheels

As glaciers collapse toward the sea, scientists struggle to figure out how fast the southern continent is melting and what that means for sea-level rise

The tools of science have changed since the golden age of physics, but many of the same questions remain

Do animals other than humans have a sense of humor? Maybe so

New techniques for teaching computers how to learn are beating the experts

At 10:31 P.M. Pacific time on August 5, NASA's Curiosity rover will begin the first direct search for habitable environments on Mars