This may pertain more to fictional world-building than to strict alternate history, but bear with me:
There is such a thing as a natural nuclear reactor. One was discovered in Gabon in 1972 when uranium ore at the Oklo mine turned out to be inexplicably depleted: the right conditions had been met for a spontaneously moderated chain reaction of the fissile material to take place, generating heat which caused underground water to vaporize.
Which brings me to the question: could the resulting energy have been harnessed by some premodern civilization? Although it didn't happen OTL, this could be an interesting idea for someone designing a fictional world.
There is such a thing as a natural nuclear reactor. One was discovered in Gabon in 1972 when uranium ore at the Oklo mine turned out to be inexplicably depleted: the right conditions had been met for a spontaneously moderated chain reaction of the fissile material to take place, generating heat which caused underground water to vaporize.
Which brings me to the question: could the resulting energy have been harnessed by some premodern civilization? Although it didn't happen OTL, this could be an interesting idea for someone designing a fictional world.