While we're talking about simple facts, how about the simple fact that 70% of the population has an unconscious preference for whites over blacks? (http://www.sciencedaily.com/releases/2009/06/090617142120.ht... .) The hard truth is that even if you think you're unbiased, you're probably not. And brain research increasingly indicates that we simply don't know our own minds nearly as well as we think we do (http://www.sciencedaily.com/releases/2008/04/080414145705.ht...).