“People have a funny habit of taking as ‘natural’ whatever they are used to—but there hasn’t been any ‘natural’ environment, the way they mean it, since men climbed down out of trees.”

— Robert A. Heinlein, book Farmer in the Sky

Source: Farmer in the Sky (1950), Chapter 2, “The Green-Eyed Monster” (p. 21)

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Robert A. Heinlein557

American science fiction author 1907–1988

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“People have a funny habit of taking as ‘natural’ whatever they are used to—but there hasn’t been any ‘natural’ environment, the way they mean it, since men climbed down out of trees.”

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Robert A. Heinlein557

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