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Originally Posted by octothorp
Do we have any proof that the universe actually behaves in this non-deterministic way at anything greater than an atomic level?
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Well atomic level events do influence macro events directly. He could drop dead because of a heart attack, where in a parallel universe the plaque molecules didn't happen to attach themselves to the artery or something.
Stuff like radioactivity and chemical reactions can have a huge influence on the macro world. In a parallel universe I was born a mutant.
Macro scale stuff can be chaotic as well, not really non-deterministic but maybe non-predictable is a better word. Stuff like the three body problem in gravity. Or chaos theory type stuff.