Jonathan Hadre is a behavioural psychologist, and he does a thing in his lectures (on you tube) where he shows a class a list of masters degree earners in a variety of hard sciences divided by gender. They're all skewed very much towards men. And he asks if this is evidence of gender bias. Then he shows the rest of the list, with all the liberal and soft sciences, which are skewed heavily female. And asks if that's evidence of bias. His point is that young men and women choose to take different things in university and college. You can't look at how few women graduate from engineering and say that's wrong. We can't force women to take engineering or hard sciences when they clearly prefer occupations with more human involvement, like sociology and medicine.