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When we stand where we are and look as far back into the past as we can, we sense something astounding. We find that our way to the present, in which we humans, the intelligent beings capable of manipulating nature according to will, stand on this blue planet, can be totally attributed to pure luck. There were billions of variables affecting this evolutionary tale at various points in time, and even if one of them was slightly altered, intelligent life would not exist today. This real...
