The inner lining of the small intestine nearly doubles in size during pregnancy and breastfeeding, according to new research in mice and human tissue. When you purchase through links on our site, we ...

A diet rich in the amino acid cysteine may have rejuvenating effects in the small intestine, according to a new study from MIT. This amino acid, the researchers discovered, can turn on an immune ...

A new kind of microscope is giving scientists a way to watch life inside cells with a clarity that feels almost unfair.

This story is part of a series exploring human anatomy and physiology complexities. Each story in this collection showcases discoveries reshaping our understanding of the body's inner workings, ...