Assume consensus that Earth is 4.6 billion years old. Life 3.6 billion. Eukaryotes, 2 billion. Multicellular life, 1 billion.
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Replying to @St_Rev
Tool users, a few million. Well, we've only got about a billion years left, at best--sun's going to go nova.
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Maybe the Great Filter is just that stars usually blow up before life gets around to building rocket ships.
6:28 PM - 31 Dec 2014
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.