Biological sex is all over the news lately. Between the presidential executive order affecting passport policy, moving transgender inmates between prisons and regulating women's sports, appeals to ...

Haag devotes the final section of his book to the many ways in which sex and gender manifest in modern human societies. He acknowledges that while some features of sex are the result of billions of ...

Most people alive today carry fragments of Neanderthal DNA in their genome. Now scientists are gaining a more intimate understanding of the ancient encounters that put it there. By Carl Zimmer One of ...