Scientific American Magazine

Modifications to superpower arsenals and to procedures for handling them could substantially reduce the risk of unintended Armageddon

Razor-sharp images of the earth's near twin reveal a mix of familiar and perplexing geologic features

A member of the U.S.S.R. Academy of Sciences shares his model of how cells recover from blows to their protein-making machinery

In less than a trillionth of a second, atoms can collide, interact and give birth to molecules. With lasers and molecular beams, it is now possible to witness the motions of molecules as one substance changes to another

Since its inception early in this century, Gestalt theory has made significant contributions to the study of perception, learning and social psychology. These contributions remain influential today

A variety of animals freeze solid during the winter months and thaw in the spring. This natural ability to survive freezing may yield clues to the cryopreservation of human tissue

The theory that all humans are descended from a recent African ancestor was promoted by geneticists who study living populations. The fossil record provides independent support for this model