Biologists are quietly rewriting what it means to be alive, and the human body has become one of their strangest frontiers. Inside our cells and microbiomes, researchers are uncovering entities that ...

Biologists mapping the human body have long assumed that every major kind of microscopic life inside us already had a place on the tree of life. The discovery of strange RNA-based entities called ...

"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 ...