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 ...

Many body parts can be transplanted or replaced with artificial equivalents, including corneas, livers, hearts, joints, and even entire faces. This technology will improve by leaps and bounds ...

Human evolution is often told as a tidy story of adaptation, yet some of our most familiar body parts still defy straightforward explanation. From the jut of the human chin to the curve of the outer ...

As a kid of the 1970s, Mary Roach sat in front of the TV watching “The Six Million Dollar Man” promise a techno-rebirth. “We can rebuild him,” the narrator intoned. “Better than he was before. Better.

It seems like every week, there’s a new headline about some kind of sci-fi-esque organ transplant. Think eyeballs, 3D-printed kidneys, pig hearts. In her new book, Replaceable You: Adventures in Human ...