Renowned science communicator Mary Roach explores modern regenerative medicine — the science of building replacement parts for the human body.

Our bodies are delicate systems that have evolved to do all the things we want and need to do, from breathing and chewing to dancing and gymnastics.

When aging and injury inevitably take a toll on our bodies, medicine comes in, and in severe cases, we might need 'replacement parts.'

Even though we have come a long way from wooden dentures and painful prosthetics, rebuilding the human body is not a linear process.

Mary Roach is the author of seven New York Times bestsellers, including Fuzz and Bonk. Her work combines popular science with a sense of humor.

In her 2025 book, Replaceable You, Roach explores the breakthroughs and complexities of regenerative medicine.