Dr. Bryan Acula, an interim professor said "Racism is provoked by fear of the unknown. The inability to recognize other humans for what they are has been shown by mainly people possessing less than average intelligence."
U of I website
Well well the stereotype of the dumb potbellied inbred racist redneck might not be far from the truth...
In case you don't want to read the article here is a handy graph you can use to figure out where you stand.