I don't see how the cost of computation can be the deciding factor here. The exact computation (34% - 33% or whatever) would probably take fewer CPU instructions than the evolved hack. And anyway both costs are tiny, because the human brain's processing power is comparable to all computers in the world combined.
Today's post, Zut Allais! was originally published on 20 January 2008. A summary (taken from the LW wiki):
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