"With mirth and laughter let old wrinkles come. And let my liver rather heat with wine, than my heart cool with mortifying groans."

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Heat may be considered, either in respect of its quantity, or of its intensity. Thus two lbs. of water, equally heated, must contain double the quantity that one of them does, though the thermometer applied to them separately, or together, stands at precisely the same point, because it requires double the time to heat two lbs. as it does to heat one.

— Joseph Black