A new population study considers human longevity.
Tuberculosis afflicted our ancestors 500,000 years ago.
Biologists have announced many Antarctic discoveries during International Polar Year.
Oil spills foul shores in San Francisco Bay and the Black Sea.
The team that decoded Neanderthal DNA last November scans it for clues to speech capabilities.
Houses in fire-adapted habitats burned during some of the worst blazes in California history.
African "megadroughts" likely played a role in where and when early humans traveled.
Two research teams have reprogrammed adult cells into stem cells—without using embryos.
Under human influence, species are spreading faster than ever.
Stem cells are revolutionizing disease study and treatment.