I used to think that 15,000 years from now Scientologists would be fighting with Mormons to break into Yucca Mountain and extract plutonium for nuclear weapons.

(The undesirable for weapons Pu240 isotope has a half life of about 6,000 years in contrast to the 24,000 year half life of the desirable Pu239 isotope.)

Now I don’t think the Scientologists will be around that long.