"The trouble is that biology is like gravity. You can argue that it doesn't matter, but you can't stop the apple from falling downward off the tree. Biology isn't destiny, of course. But it is pretty darn determinative. It means a man can't have a period or a baby. It means that no matter what he does, he can't change his chromosomes from XY to XX."

A most sensible article about gender and race and contemporary ideas of about identity.