3 ms·

I would think 'primitive + nuclear' the scarier prospect.

• ben_w 8y ago
  May I intrigue/terrify you with naturally occurring fission reactors: https://en.wikipedia.org/wiki/Natural_nuclear_fission_reactor https://en.wikipedia.org/wiki/Natural_nuclear_fission_reacto...
  • Dylan16807 8y ago
    Of the kind that can't stay hot without water moderating, which is a different category in my book.