In steadfast pursuit of gender equality and to promote nonconformity, it’s become popular in some social circles to start early, very early, by raising young children in a gender-neutral way: not revealing the baby’s sex at birth, dressing them and their bedroom in various shades of oatmeal, encouraging them to play with gender-neutral toys. There’s also pressure on corporations to help; parental complaints led Target to stop sex-segregating its toys, for instance.

Offering kids the opportunity to pursue what they’d like, freed from societal expectations, is an undeniably positive thing — whether it has to do with toys, clothing, or their future aspirations. But the scientific reality is that it’s futile to treat children as blank slates with no predetermined characteristics. Biology matters.