You guys are close-minded dicks. This sounds completely plausible. Though he doesn't mention all the fast-twitch muscle fiber that black people have. He should if he wants to be credible.
"Where did the 5 races come from? Why do they look so different?" This guy needs to get out of his doublewide trailer more.
No on second thought with the current cultural climate this guy needs to write a book called "The 5 races. Where they came from and why they look so different. And aliens.” It would tap the largely unleveraged "crazy fuckwit" demographic. I will put it on my coffee table right next to Paris Hiltons book. And I will introduce it as my holy book and quote from it the next time the Mormons or Jehovah’s witnesses stop by... Good times.