The differentiation of physical attributes and intelligence can be said to apply also to different races of human.
Pointing this out, however, is forbidden. In fact, scientist and discoverer of DNA, James Watson, was ostracized so completely from his profession for pointing out the link between race and intelligence that he was forced to sell his own Nobel Prize to support himself.
As luck would have it though, it was purchased for over $4 million and returned to him by the winning bidder.
Thankfully, it seems, a few good men can still triumph over the weight of the anti-science left.