That’s one reason these four computers were linked, so they could constantly compare what they were doing. If one did something dumb, the other three could overrule it and shut it down. But if even a tiny timing error developed, two of the four could split off and go rogue – giving the vehicle directions that contradicted what the other two computers were instructing it to do – with no one to break the tie and vote on which pair was right.
-Chris Hadfield
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