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I installed solar panels in my backyard, and then texted my dad that my basement is now powered by fusion with a roughly eight minute delay.

He then asked "isn't pretty much all power on earth outside of nuclear fission technically done by fusion if we give enough of a delay?". I didn't really have a rebuttal to that.

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Not geothermal I would think?
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Actually thinking back I think he might have said "nuclear fission and geothermal". This was months ago.
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Arguably nuclear fission in this case.
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Geothermal is not nuclear fission. It's some combination of primordial heat from the formation of the Earth (which was gravitational energy) and radioactive decay (which is distinct from fission).
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