A study published today in the journal Developmental Cell uncovers new insights into how the heart forms during the earliest stages of embryonic development.

The heart consists of 4 chambers--2 atria (upper chambers) and 2 ventricles (lower chambers). Blood passes through a valve as it leaves each chamber of the heart. The valves prevent the backward flow ...

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

In TODAY.com's Expert Tip of the Day, a heart surgeon reveals the common oral hygiene product that may be hurting your ...

Fake or polite smiles, on the other hand, usually involve only the mouth muscles. The eyes remain wide or indifferent, and ...