A new genetic study seems to indicate human intelligence is primarily the result of two distinct genetic copy errors. The timing of the errors seems to coincide with the emergence of Homo (shaddup, you) as a genus. The results will, presumably, be contentious and generate who knows how many slow-motion flamewars in the scientific journals. Still, it's interesting to know that the less than two percent of us that's not chimpanzee may be mostly encompassed in exactly two places on our genome.