Sexuality and gender play a profound role in shaping identity, but for much of human history how they are determined has remained obscure. How does sexual orientation develop? What is it? Can it be changed?

Improving your athletic ability is possible with technology created by engineers William “Buddy” Clark and Mike Ressler. See how their innovations can be easily used to analyze and step up …

Though many animals display cooperative behavior, human cooperation is distinct. Alan Alda hosts E.O. Wilson, Sarah Hrdy and other leading evolutionary biologists, anthropologists and humanitarians as they examine the origins and evolution of human cooperative behavior.

Acknowledging the scientists who blazed intellectual trails before him, Isaac Newton wrote: “If I have seen a little further it was by standing on the shoulders of giants.” In this …

We once shared the planet with Neanderthals and other human species. Some of our relatives may have had tools, language and culture. Why did we thrive while they perished?

CRISPR: It’s the powerful gene editing technology transforming biomedical research. Fast, cheap and easy to use, it allows scientists to rewrite the DNA in just about any organism—including humans—with tests on human embryos already underway.