An excellent Radiolab podcast called "Cut and Run" explains why a small area in Kenya produces so many incredible long distance runners (five American high school students have run sub-four minute miles . . . ever . . . while in one class in one school in Kenya, there were four kids who did it) and the program also explains why I get so fucking hot in the summer -- Kenyans generally possess a "nylotic" body type -- tall, slender, and with very long and tapered limbs -- and this body type sheds heat well and people who live in hot and dry climates have often evolved in this manner . . . and I am neither tall nor slender, and my limbs are stubby and thick (Popeye forearms and bulging calves) and while this is good for lifting things, it is NOT good for shedding heat . . . but that's not the only reason that the Kenyans from this region are great runners: for the final piece of the puzzle, you'll have to listen to the podcast, but I will tell you that involves circumcision and a pointed stick (and American runners aren't going to catch up to the Kenyans any time soon, judging by this statistic).