Scientific American Magazine

Ancient stone tools from Kenya shatter the classic story of when and how humans became innovators

Alien technology is probably not causing Boyajian's star to dim mysteriously. But alternative explanations are hard to come by

Loss of some DNA during evolution may have helped create big brains and our male–female relationships 

Energy decisions that India makes in the next few years could profoundly affect how hot the planet becomes this century

Gene studies were supposed to reveal the disorder's roots. That didn't happen. Now scientists are broadening the search

New movies of drug proteins or photosynthesis in action, shot in millionths of a billionth of a second, show how the molecules work—or fail

To test ideas of animal domestication, a bold experiment in Siberia put evolution on a fast track