I'll make it short. In my last game, the Greeks had a nuke even though nobody had built the MP. They didn't even know rocketry. Not sure about nuclear fission, they might have gotten that somehow. They never used the nuke and I only noticed it in the replay after I won. They had only built one, probably by accident, like they sometimes build carriers, which they aren't really supposed to build. But still, they built it without the MP and without (one of) the required technologies. Has anyone else seen this? If it happens regularly and is not just a bug, it's too much of a cheat, even for the Civ 1 AI.