Neurons in the brain's reward center may explain cocaine's addictiveness.
Scientists are discovering the tactics malaria parasites use to infect cells.
New brain images offer clues to introspective abilities.
The largest survey yet of human genetic variation.
Gut microbe study reveals that ancient diets suited our bodies better.
Beneficial gene enables Tibetans to thrive at high altitudes.
What's the recipe for living a very long life?
Why can't some teens resist taking risks?
Mood disorders are linked to disturbances of circadian rhythms.
DNA analysis reveals a new—and deadly—strain of flu.