Yesterday, Dr. Oz was back on Oprah to talk about health, and, in one of the most interesting segments, he broke down the male and female brains. First of all, did you know that we all start off with female brains in utero? It's not until testicles are formed, that the testosterone shoots up to the brain and changes it. There are fundamental differences between male and female brains, for example, women have a whole section that's dedicated just to worrying about shit. Men typically have larger brains (women's brains shrink with pregnancy), but they aren't any more powerful than women's. We just pack more neurons into a smaller package. (Sound familiar?) Clip above.