Science News

Nail biting -- like skin picking and hair tending -- stems from an evolutionarily adaptive behavior: grooming. But in "pathological groomers," as they're known in in the world of psychiatry, that healthy urge goes haywir...

Here's today's roundup of science, nature and environment news from the Bay Area and beyond.

The annual cleanup is the largest, international volunteer event. How much trash has been collected and why is it important?