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Buster fin said..
Steroid chicken.
On a side note, children are often born recently without wisdom teeth. The thinking being that as our diet has softened, the jaw is becoming smaller and micro evolution has decided we don't need the teeth.
I would say that unless the people with wisdom teeth are not having kids and those that don't get them are having more kids than the average, that evolution would not change anything.
I thought the whole idea of wisdom teeth, at least in evolutionary terms, was that it was a replacement tooth as we lose others and the one at the back grows to push the others forward. For this to devleop, it would have added something decent to our survivability, or been a leftover from an ancestor. Having wisdom teeth doesn't really affect your reproductive success.