Napoleon Bonaparte was the first emperor of France and one of the world's most significant military leaders, but at a price.

A partial knee replacement fixes only the damaged part of the knee, while a total knee replacement fixes the entire knee. People who have a partial knee replacement might heal and get back to normal ...

Pacemaker batteries last five to 10 years before the whole device needs replacing. If a pacemaker battery is low, it can cause irregular heartbeats or make the heart beat too fast or too slow.