"They were human. They were probably significantly more technologically advanced than we are. They existed tens of thousands of years ago; perhaps hundreds of thousands, we can't know for sure. It's difficult to determine what really happened to them because their entire cultural memeplex was lethally irradiated. Their core cultural concepts, the things they created, and stood for, and valued highly, can never be known or propagated again. "We think an idea stole into their culture which they did not have adaptations to defend against. A complex of ideas. A Memeplectic/Keter-class end-of-world
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