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khafra comments on Open thread, November 2011 - Less Wrong
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Fair enough. I should have said "if the dinosaurs had been intelligent, and their extinction was due to nuclear winter following a large thermonuclear exchange, the history of our own species could still look substantially similar." Although evolution might have proceeded a bit differently with higher background radiation.
Phrased that way your point seems very strong. Indeed, dinosaurs died out only 65 million years ago, which isn't that long ago, especially in the context of this sort of filtration event.