Remarkable fossils found in North Greenland have helped researchers solve a 500-million-year-old puzzle surrounding ...

New research from the University of Pittsburgh reveals how the immune system defends against intestinal parasitic worms, or helminths, one of the most common infections worldwide in communities with ...

A century-old fossil long mislabeled as a caterpillar has been reidentified as the first-known nonmarine lobopodian—rewriting ...

Researchers have discovered a new type of intestinal cell in pythons that helps them completely digest bones. Scientists ...

The human body has three primary lines of defense to fight against foreign invaders, including viruses, bacteria, and fungi.

Learn more about the nectocaridid, an ancient marine creature that looks like a squid but actually belongs to a family of formerly fierce, predatory worms.