Silicon used for making computer chips must be pure to something like 12 decimal places (99.999 999 999 999% pure). When I was in college taking physical electronics (dealung with a lot of quantum theory) one of the excercises was to see what effect contamination of one part in a BILLION would make. The result was that it would basically render the batch unuseable.
I suspect that 4% difference between chimps and humans is MUCH more than they are willing to admit. Literally it is the difference between constructin a vessel that will take men to the moon and back and swinging in trees and then picking fleas off each other's back (sorry if I offended tre swinging, flea picking 'Rats).