The rules of the game are very simple

"It is hard to believe. It is incredible! In fact, most people don't believe that the behaviour of, say, me is the result of lots and lots of atoms all obeying very simple rules and evolving into such a creature that a billion years of life has produced.

There is such a lot in the world, there is so much distance between the fundamental rules and the final phenomenon that it’s almost unbelievable that the final variety of phenomenon can come from such a steady operation of such simple rules.
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The truth is so much more remarkable." - Richard Feynman