She says when male and female insects look different, that is called sexual dimorphism – and this can happen in a variety of ...

Study could help reveal why some mental health disorders vary between men and women — but it's not clear whether the differences are due to sex or gender.

For years, people have been saying that men are from Mars, women are from Venus, but when it comes to both sexes' actual brains, it is almost impossible for scientists to tell them apart. For ...

A study from the University of California, Davis, found that temperature affects the sound and quality of male frogs' mating calls. In the colder, early weeks of spring, their songs start off ...

John Stossel is the creator of Stossel TV videos, and author of "No They Can't! Why Government Fails—But Individuals Succeed." Am I sexist? I think there are differences between men and women—traits ...

The question of the differences between so-called male and female brains has always sparked curiosity and fueled debate. Are we truly wired differently, or are these differences simply the result of ...

When Neanderthals and our species had babies together, the prehistoric pairings tended to follow a distinct pattern: Neanderthal dads and moms who were Homo sapiens — the same as modern humans. Since ...

Biologists have long wondered why caribou are the only deer in the world in which females—like males—have antlers. A study of ...