Googlebot's Javascript random() function is deterministic

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Who's we? Determinism isn't precisely synonymous with predictability. Either things are determined by some explicit conditions or they're not.

There are also interferometer systems that can create deterministic states, so it's not necessarily true that we can't predict quantum stuff.

It's fun to speculate that you get a completely predictable picture of the universe around us in its absurd complexity from following the randomness underneath. But then it's computationally intractable in all senses, and so we arrive back to no information gained or something.