Archaeopteryx is the fossil that clearly demonstrated Darwin's views. It's the oldest known fossil bird, and it helps show that all birds -- including the ones alive today -- emerged from dinosaurs.

Have you ever been stuck on a problem, puzzling over something for what felt like ages without getting anywhere, but then ...

For millions of people around the world with essential tremor, everyday activities from eating and drinking to dressing and ...

Cerebrovascular disease affects blood flow to the brain, increasing stroke risk. Learn about its different types, causes, ...