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What conditions have to be in effect for evolution by natural selection to occur? The words I put into Darwin's mouth were simple: Give me Order, and time, and I will give you Design. But what we have subsequently learned is that not every variety of Order is sufficient for evolvability. As we saw illustrated by Conway's Game of Life, you have to have just the right sort of Order, with just the right mix of freedom and constraint, growth and decay, rigidity and fluidity, for good things to happen at all.
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Daniel C. Dennett (Darwin's Dangerous Idea: Evolution and the Meanings of Life)