Scientists explain the lime green look of spring.
Analysis of trash mounds shows how a regional hub collapsed after the onset of the Late Antiquity Little Ice Age.
Newly-discovered fossil deposit contains more than 50 unknown species from the Cambrian Explosion, when most complex body plans appeared.
The telltale tau proteins present in the disease known as CTE display distinctive features.
Indoor temperature and moisture in the U.S. is closer to climates in Africa than to anywhere else on Earth.
When the foraging sea mammals crack shells to collect food, they produce distinctive evidence.
New findings suggest that ordinary sound has negative gravitational mass.