The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

A team of scientists from Harvard Medical School and Duke University has created a new kind of tissue that can change heart activity using only light—no wires, no surgery, no harm. This groundbreaking ...

More than 800,000 Americans will have a heart attack this year. Fortunately, most will survive the traumatic event — but many will emerge with hearts damaged beyond repair. “Many tissues in your body, ...