Tracks from two humanlike species crossing paths in ancient Africa shed light on the tale of our specialized locomotion.

You've probably heard the claim that it takes more muscles to frown than to smile. It's usually framed as a feel-good reason ...

The brain is a unique place. It is shielded from much of the body by the blood-brain barrier, meaning it's protected from ...

Keep your hands off your eyes Your eyes are extremely sensitive: Not only can touching them introduce germs, but you also run the risk of accidentally inserting micro-particles of dirt, which can ...