50M years for a new generally intelligent species?
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50M years ago our direct ancestors were basically little squirrels.
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Jumpstart or taint?

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Just trying to be nice to the next tenants.
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Our technological artifacts will leave a much larger trace in the fossil record than our bones. The dinos didn't, so they indicate that the evolution of intelligence may have a tendency to get stuck in local optima that get only resolved by meteors and super volcanoes.
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Future civilizations will dig up fossilized iPhones.
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It could be even over next week, if someone presses the wrong button, or a super volcano goes VEI 8.
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The context made clear what you meant.
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Why should biological, chemical and geological processes that left the structure of insects and leaves intact over 400 million years have to grind all of our 20 Billion non compostable and fully inedible mobile phones into dust?
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You know about The Long Now Foundation, right?
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I sometimes run into Danny Hillis or Stewart Brand
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