Evolution is pretty much a fact. Charles Darwin's theory of the origin of species I don't believe is a fact. I think it's the best explanation we have. The only reason I think people are so adamant about it being a fact is because they don't want to give bible thumpers fuel to criticize something they don't understand. Nobody would flip out if string theory doesn't turn out to be true. But because evolution involves all these implications about the meaning of life, I think people feel like they have to know for sure. I think there are things that people should be more willing to admit cause problems for the theory. Dawkins addressed irreducible complexity in his latest book, not very adequately in my opinion. I think the example of the bacteria developing the ability to digest citrus actually turned out to be a better argument against the point he was trying to make.
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