1.   As his body gets lean and dirty and hairy, his eyes get bluer and his teeth get whiter, and he looks better and better.

2.   But now his teeth were getting out of shape again, and he had to make a decision.

3.   For another, if meat spelled the difference, why did the teeth of Homo erectus get so small and round?

4.   His teeth are getting stronger, and those unsightly skin lesions have shrunk to the size of half-dollars.