Most drivers probably don't know what a transmission valve body is, but it's an important part of your car that needs to stay ...

Q. I have a leaky heart valve that may need surgery down the road. Can you tell me about heart-valve surgery in one of your columns? A. First, let’s explain briefly how the heart works.

Researchers at the Imperial College London and Harefield Hospital in the UK have developed a novel treatment that harnesses body's natural repair mechanisms to build a living heart valve.