"I am not a scientist. I have never analyzed the far reaches of the solar system through the lens of a telescope nor scrutinized cancer cells under a microscope."

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Hiking a ridge, a meadow, or a river bottom, is as healthy a form of exercise as one can get. Hiking seems to put all the body cells back into rhythm. Ten to twenty miles on a trail puts one to bed with his cares unraveled.

— William O. Douglas