"I continue to be amazed at how much dust is stirred up by simply asserting the biological observation that, in animals and vacular plants, there are but two sexes, and those sexes are defined by the reproductive equipment they have. Males are “designed” (I’m speaking teleologically: “evolved” is what I mean) to make small, mobile gametes, and females to make big immobile ones. For decades this has been uncontroversial: A truth universally acknowledged, to paraphrase Jane Austen. Now, however, for reasons known best to themselves, a small but vocal group of ideologues is denying the sex binary. In my coauthored paper coming out in late June, we hazard some guesses, but those of you following the controversy probably realize that it involves trying to impose one’s ideological views onto nature. This doesn’t work so easily with the sex binary, as even nonscientists can observe it with their own eyes. The result is that deniers of that binary, such as Agustín Fuentes and Laura Helmuth (editor of Scientific American who’s published several pieces denying a sex binary), face considerable pushback from both scientists—who work with male and female organisms—and “regular” people, who have eyes to see and neurons to analyze."