"Look round and round upon this bare bleak plain, and see even here, upon a winter's day, how beautiful the shadows are! Alas! It is the nature of their kind to be so. The loveliest things in life... are but shadows; and they come and go, and change and fade away, as rapidly as these."

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We scientists have fantasies of being uniquely qualified to make great discoveries. Alas, reality is cruel: most of us are replaceable. For the vast majority of scientific contributions, if scientist X hadn't achieved it that year, scientist Y would have achieved the same result or something very similar soon thereafter.

— Jared Diamond