I'm really interested in male and female brains and whether female brains or male brains are better at maths. You sit men and women down and give them a maths test and they will do fairly equally. Then you set up the same test, but with different people, and make them tick a box to say whether they are a man or a woman, and the women do significantly worse in the maths test than they did previously in a group set.

Interview, The Observer, 12 Oct 2014