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 ...

As night seeped across the mountains of southern China, a "long"-fingered creature moved through the leaves near a trail and tucked itself under a rock. But its hiding place wasn't quite hidden enough ...

Viruses typically aren’t considered ‘alive,’ as many core biological functions are outsourced to their potential hosts. But a newly discovered organism appears to straddle the line between virus and ...