Comment by amluto

I don’t find this particular example very impressive. The U-238 answer is a bunch of disconnected sentences. U-238 is radioactive and releases something like 4 MeV per decay, not 200 MeV. It is not fissile, although one might calculate the net output of whacking it with enough neutrons that it eventually fissions. And if you ate it, unless your stomach was a breeder reactor, you would only have access to the decay energy, which would be large but would release so slowly as to be useless.

ChatGPT is usually more impressive than this, IMO, at least when asked shallow questions.