ANSWERS: 4
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One of them can keep going while you operate on the other one. You can give away twice as much love.
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Im thinking, like major blood flow, one contracts while the other one relaxes, the hearts work less, for the same amount of "performance".
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Well, if you are a time lord its an absolute necessity. Difficult to regenerate without two hearts.
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If one stops you have one left :D
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