"It appears that consciousness is a very rare & precious thing & we should take whatever steps we can to preserve the light of consciousness. Only now, after 4.5 billion years has that window been open. That’s a long time to wait and it might not stay open for long.” -
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Earth and all life on it has been around for 4.5 billion. Humans only the last six million years.
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Ah, but define life. Scientists still don't agree on a definition. Is an oxygen molecule alive? No? Yet it knows what it is. And it knows what to do in the presence of two hydrogen molecules which also know what they are.
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