Some have a dream that, one fine day, there will be equal numbers of men and women in all jobs, including those in scientific research. But I think this dream is Utopian; it assumes that if all doors were opened and all discrimination ended, the different sexes would be professionally indistinguishable. The dream is sustained by a cult of political correctness that ignores the facts of life-and thrives only because the human mind likes to bury experience as it builds beliefs. Here I will argue, as others have many times before, that men and women are born different. Yet even we scientists deny this, allowing us to identify the "best" candidates for jobs and promotions by subjecting men and women to the same tests. But since these tests favour predominantly male characteristics, such as self-confidence and aggression, we choose more men and we discourage women. Science would be better served if we gave more opportunity and power to the gentle, the reflective, and the creative individuals of both sexes. And if we did, more women would be selected, more would choose to stay in science, and more would get to the top.