A great piece on the science behind fast and efficient throwers:
[…] But MLB pitchers aren’t the only expert throwers; most healthy people can throw faster than our much stronger chimpanzee relatives, who max out at around 30 mph. A study of boys from the ages of 8 to 14 who were only moderately trained in throwing could still throw two times faster than chimps. So how and why did humans evolve to become expert throwers?