YouTube scientists and champion explainer Vsauce, fresh off his awesome Why do we pay games? video, is back with an biological explanation of human size. Lots of factors go into this—earth’s gravity, the laws of physics, our genetics, simple biology, nutrition, social structure, and health. How big a deal is something like nutrition? Well, North Koreans are about three inches shorter than South Koreans, and the gap is growing.
See, Vsauce? We know stuff too.