Thrice

You know how to do it.

Just this time please read the sentence before you post and attempt to make it sound correct. Thanks. Hope this one turns out good.

Calculus

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Lew Harrison, who looked like an anarchist with his red eyes and fierce black beard, had been writing furiously in one corner of the room. "That's good—happiness by the kilowatt," he said. "Buy your happiness the way you buy light."