Evidence from our closest evolutionary relatives suggests that we might not be the only animals with a sense of gender identity.
Society increasingly accepts gender identity as existing along a spectrum. The study of people, and their remains, shows that sex should be viewed the same way.
We’ve all been taught that human fertilization is an Olympic-style competition. The truth is that it’s much more like a gigantic lottery.
The outhouse of a 19th-century Boston brothel might not be the first place you’d think to look for revealing clues about the past—but maybe it should be.
Cultures around the world fear unrequited love. One strategy to avoid the pain of rejection might be to spread your love around—but does that work?
The human birthing process is more difficult than that of any other primate. One researcher is using bones and computers to figure out why—and what to do about it.