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How do you seed when there's no activity on all three fronts?

I fall back on real time neutrino event detection :-) https://gcn.gsfc.nasa.gov/amon_hese_events.html

Data hasn't come in since 2019. Is that because none have been detected since? Or did the program halt?

Just a slow time for neutrinos. Any RNG can be expected to produce a sequence of zeros lasting two years, if you leave it long enough.

That's not a very useful RNG then.

Is it truly random though?