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Nornagest comments on The Extended Living-Forever Strategy-Space - Less Wrong
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A little less than 50 bits of entropy, actually, if you're choosing truly randomly. Total entropy of a sequence scales additively with additional choices, not multiplicatively: four coin tosses generate four bits of entropy. 50 bits is enough to specify an option from a space of around 10^15, but the configuration space of those 10^10-11 neurons in the human brain is vastly larger than that.
I didn't know that. Fair enough, seems likely 'signal preservation' is much more costly than I originally realised and not worth pursuing (I think the likelihood of revivification is the same or better than cryonics, but the cost in terms of hours spent tapping at a keyboard is basically more than any human could pay in one lifetime)