The testes, also known as testicles, are the primary male reproductive organs. They are responsible for producing sperm and ...

Biological sex is usually described in simple binary terms: male or female. This works well for germ cells (sperm versus eggs), but for other body organs it is of little help. A new study by the Max ...

Bones and Organs At the height of the cavity is the liver, the body’s largest organ. It acts like a filtration system. It rids the body of toxins and produces bile, which aids in the digestion and ...

PORTLAND, Ore. — Crazily diverse shapes of male genitals across the animal kingdom — from curlicues and Y-tubes to multiknobbed, tendrilly whazzits — may evolve faster than any other animal structures ...

Evolution has given humans countless unique features, but one body part stands out as an unsolved puzzle: the human chin.

Biological sex is usually described in simple binary terms: male or female. This works well for germ cells (sperm versus eggs), but for other body organs it is of little help. A new study now shows: ...