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Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/booksMore serious answers to absurd questions at: https://what-if.xkcd.com/If every h...
Tdlw: Cherenkov radiation from buried nuclear waste will still glow a faint blue light for a couple of centuries.
Power grid within days. Batteries and renewables for a few years until parts break down.