God put uranium on the planet. It wasn't meant to be a plant, though!

No, it's a charmstone. Just put it in your pocket, baby! Good luck! Free uranium for all! 

(I'm honestly wondering why there aren't uranium ovens available to poor people yet!?)

http://en.wikipedia.org/wiki/Natural_nuclear_fission_reactor
http://en.wikipedia.org/wiki/Spontaneous_combustion_%28combustion%29
http://en.wikipedia.org/wiki/Spent_fuel_pool
http://en.wikipedia.org/wiki/Dry_cask_storage