Politically Incorrect Truths
While perusing articles at Slash Dot, I found an article at Psychology Today called "Ten Politically Incorrect Truths About Human Nature." Though they don't go into great detail about the science behind the explanations are still good.
Regular readers of the LibertyBob site know that I'm a big proponent of science and reason. Often things that are politically correct are just dogmatic crap created by whiny types who had a bad experience in their childhood and are afraid that others will suffer if they don't interfere. It is important that reality be pushed even if it is offensive to a few (or even many). True freedom comes from reason.