It is one of the most powerful involuntary actions the human body can perform. But is a big sneeze a sign of illness, pollution or something else entirely? How worried should we be about a sneeze? It ...

Oluseun Olufade, MD, is an Orthopedic Surgeon and Assistant Professor of Orthopedics at the Emory School of Medicine. The sternum protects your heart and lungs by acting as a shield in your chest.

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...