"I think I get used to, even addicted to, the feelings associated with the end of a long training run. I love feeling empty, clean, worn out, starving, and sweat-purged. I love the good ache of muscles that have done me proud. I love the way a cold beer tastes later that afternoon. I love the way my body feels light and sinewy."

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Geology is part of that remarkable dynamic process of the human mind which is generally called science and to which man is driven by an inquisitive urge. By noticing relationships in the results of his observations, he attempts to order and to explain the infinite variety of phenomena that at first sight may appear to be chaotic.

— Reinout Willem van Bemmelen