@PhilosopherRex It gets worse. That bell curve is ONLY for children between 11 and 13 wherein girls start puberty before boys, and have a once-in-a-lifetime developmental advantage, and they can only break-even. By 17 boys are smarter than girls once puberty kicks in.
See Richard Lynn's studies. The reason you only see the 11-13 graph is because it promotes "equality"