We&#x27;ve known this for a while, it boils down to: barbies.<p>Fixing this problem is <i>really, really</i> hard. Assuming I gave my daughters equal access to both barbies and chemistry kits, which would they choose? Kids want to fit in with their friends. Boy nerds get beaten up, girl nerds get ostracised. What does that lead to? The child choosing their gender stereotype (applies both ways) so that they can fit in. It&#x27;s what the herd is doing and results in girls avoiding engineering and boys avoiding, say, nursing.<p>It&#x27;s a systemic disease and is highly contagious. One possible solution is an elementary school where the entrance requirement is determined by the parents: girls get barbies AND chemistry kits. Boys get toy cars AND sewing kits. Their social group shouldn&#x27;t be determined by gender, rather interest.