We have trillions of body clocks — a central one in the brain and others in each cell of our body. Here's how they work with light to control our health. When you purchase through links on our site, ...

Science writer Mary Roach chronicles both the history and the latest science of body part replacement in her new book. She also answers the... From heart to skin to hair, 'Replaceable You' dives into ...

YOU WANT TO build more muscle. And you want to blast fat. And most of the bro-science out there will tell you that that simply can’t be done. The science of body recomposition says otherwise. Regular ...

Science writer Mary Roach is fascinated by the human body, especially, she says, the "gooey bits and pieces of us that are performing miracles on a daily basis." Take the human heart, for instance. If ...