Quote: "Yet Hassett knows her stuff – and a lot of that stuff is very interesting indeed. Along the way, she debunks all sorts of received wisdoms. The idea, for instance, that women’s menstrual cycles fall into sync when they live in proximity. Hassett says that this ‘seemingly unkillable myth’ just ain’t so:..."

I'm sorry, but Hassett is wrong on this one. I've witnessed a dorm full of girls in my student years syncing their menstruation in like maximum 2 months after school was started. Multiple years was happening after they came from vacation. My girlfriends at the time were in sync with all other girls in same dorm.

I've witnessed later in life girls I shared apartments with having their menstruation synced just the same.

And fucking finally, my wife and daughter have their menstruation in sync nowadays.