They weren’t snakes, of course, but nematodes, also known as roundworms—and, it turns out, they’re the most common ...

A study in the journal Nature explains how age reshapes the blood system. In both humans and mice, a few stem cells, or ...

Mice genetically engineered to lack the ability to make the amino acid cysteine, and fed a cysteine-free diet, lost 30% of their body weight in just one week, a new study shows.

The average American can expect to live about 77 years, according to the Centers for Disease Control and Prevention. Retro ...