http://www.w3.org/ns/prov#value | - (As an aside, I always thought the explanation in the 'Matrix' that humans were used as batteries didn't make sense scientifically (see 2nd law of thermodynamics) and that a better explanation was that the AIs realized they could utilize the humans for their intuition and other human qualities, in the same way that we use computers -- hence the need for the matrix.)
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