Biologists are quietly rewriting what it means to be alive, and the human body has become one of their strangest frontiers.

Biologists mapping the human body have long assumed that every major kind of microscopic life inside us already had a place ...

The human body is an amazing, curious, and disgusting thing. At any given moment, millions of tiny lifeforms are making their way across your body—both inside and out. And now, researchers say they've ...

In the coming decades, we might figure out how to make an entirely new kind of life: a mirror cell, in which every molecule is the mirror image of those found in normal cells. Such reversed cells have ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here’s what you’ll learn when you read this story: A manned submersible dove over 31,000 feet below sea ...