Scientists have known about these 'blobs of fat' for more than 130 years, but they're just understanding all the roles they play in the body.

Single-cell microbes known as bacteria are simpler than most forms of life, yet they are still intriguingly complex.

Scientists found the 'secret molecule' that allows Geobacter microbes to exhale electrons over vast distances underground

The microbes had been dormant below the ocean floor for eons, buried since the time of the dinosaurs. Then a team of scientists in Japan woke the little organisms up.

Antibiotic-resistant bacteria may be able to pass their genes on to others.

A woman's pet rat gave her a potentially fatal illness known as "rat bite fever."

A relatively rare chemical reaction can turn people's pee purple.

More than 100 people have fallen ill with Legionnaires' disease after attending a North Carolina state fair last month, and officials say the outbreak source may have been hot tubs.

Clinical observations and animal studies suggest that certain gut bacteria boost blood-alcohol levels and contribute to fatty liver disease.