masculinity. ‘I should imagine, when they opened up the Y-chromosome, scientists thought they knew what they would see,’ wrote Caitlin Moran in the Times of London. ‘A pile of old vinyl. The off-side rule. Pants their mothers bought them. A Yorkie bar. Absolute, unbloodied optimism that you can succeed at anything — rewiring a whole house, winning a war, lifting something heavy — except fightin...