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Why so? I see this written quite a bit, but it doesn't square with what my phys undergrad...

There are many sources of truly random events (as in quantum), including tunneling in diodes.

Then there are chaotic systems which are good enough to be random. There, even in a deterministic universe (it doesn't appear to be) and given infinite amount of computational power (impossible), you'd still be unable predict the future (due to measurement error).

TRNG are hard to do correctly, but why are they limited to geiger counters and radioactive mtls? Is it because you can't "hack" the nuclear core (not exactly true, but sure)? Again that would be a doing the TRNG right, not a lack of randomness in physical systems.

Yeah, but paper tigers like Zuckerberg are on that list. The top 1500 richest includes the twiddly twins and their bitcoin empire.

They're all one tech bubble bursting from loosing most of their wealth.