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2 billion years of trial and error will give you solutions better than any engineer who has only lived for 50 years can devise.

I find this quote puzzling. You care to enlighten me on it?

Evolution arrives at solutions more clever than any human being possibly could even though the mechanism by which it operates is simply trial and error, because it acts over such a long time. Humans only have 80-100 years to accumulate experience, so they can't make something better.

Okay...that's better. Thanks for the explanation.