it has been plausibly argued to me that all the roads to nuclear weapons, including plutonium production from U-238, may have bottlenecked through the presence of significant amounts of Earthly U235
This has interesting repercussions for Fermi’s paradox.
This has interesting repercussions for Fermi’s paradox.
Yes, particularly in the context that you and I discussed earlier that intelligent life arising earlier might have had an easier time wiping itself out. Although the consensus there seemed to be that it wouldn’t be a large enough difference to matter for serious filtration issues.