I particularly liked a graphic, which I found on a presentation by Leslie Liebermann from the University of Central Florida and I've rejigged her idea in the picture above. The ideal in each case is on the left!
Now here's another interesting insight. The human genome was delivered into the public domain in June 2000 by Bill Clinton and Tony Blair (thanks, lads, good job on the sequencing) and published by the real scientists, including three Irish analysts Ken Wolfe, Aoife McLysaght and Karsten Hokamp, the following February. Five and a half years later, the Chimpanzee genome was completed (Nature 437:69-87 01 Sep 2005). Another Clint was more modestly in the background of that second project as the adult male chimpanzee who contributed his DNA. Everybody knows that the two species are remarkably similar genetically (98%, 99% identical depending on the details of what you measure). But an interesting table in the Chimp genome paper reports the differences where the normal variant in chimps is the cause of a disease in humans. Nearly half of these reverting candidate genes (you can hypothesize that the ancestral human condition was the same as chimps but mutated to accommodate the different lifestyle of the walking ape) are related to digestion and diabetes.