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Kingreaper comments on The Importance of Self-Doubt - Less Wrong
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Did you miss this bit:
Sensitivity to initial conditions is one thing. Sensitivity to 1 billion SF in a couple of decades?
The universe took about 14 billion years to get this far - and if you look into the math of chaos theory, the changes propagate up very rapidly. There is an ever-expanding avalanche of changes - like an atomic explosion.
For the 750mb-or-so of data under discussion, you could easily see the changes at a macroscopic scale rapidly. Atoms in stars bang into each other pretty quickly. I haven't attempted to calculate it - but probably within a few minutes, I figure.
Would you actually go as far as maintaining that, if a change were to happen tomorrow to the 1,000th decimal place of a physical constant, it would be likely to stop brains from working, or are you just saying that a similar change to a physical constant, if it happened in the past, would have been likely to stop the sequence of events which has caused brains to come into existence?
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By the way, I'm reading your part 15, section 2 now.
Option 2. Existing brains might be OK - but I think newly-constructed ones would have to not work properly when they matured. So, option 2 would not be enough on its own.