When people see the effects of poor nurture and call it nature, they discourage the training of women for key positions, and that strengthens the view that the disparity is due to biology. What makes the biology assertion so insidious is that it sabotages the development of women, and it relieves men of any responsibility for examining their motives and practices. That’s how gender bias “plants the evidence” that leads some people to see the effects of their own bias and call it biology. And that perpetuates a culture that women don’t want to join.