The very large brain that humans have, plus the things that go along with it - language, art, science - seemed to have evolved only once. The eye, by contrast, independently evolved 40 times. So, if you were to 'replay' evolution, the eye would almost certainly appear again, whereas the big brain probably wouldn't.

I do feel visceral revulsion at the burka because for me it is a symbol of the oppression of women.

For me, the level at which natural selection causes the phenomenon of adaptation is the level of the replicator - the gene.

Richard Dawkins Quotes