Boys tend to be more active and do more sports, which causes a bit of a virtuous cycle where because they're more active, they get better at things like sport t

Boys tend to be more active and do more sports, which causes a bit of a virtuous cycle where because they're more active, they get better at things like sport than girls simply because they're practicing. Girls raised with brothers tend to also be more active and better at sports. I recently read Pink Brain, Blue Brain by Lise Eliot, which explores a lot of these differences, where they come from, and to what extent we can find biological causes for them. It's really interesting, and she gets into a lot of details analysing various studies and theories.