"Anyone who seeks for the true causes of miracles, and strives to understand natural phenomena as an intelligent being, and not to gaze at them like a fool, is set down and denounced as an impious heretic."

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The last few centuries have seen the world freed from several scourges-slavery, for example; death by torture for heretics; and, most recently, smallpox. I am optimistic enough to believe that the next scourge to disappear will be large-scale warfare-killed by the existence and nonuse of nuclear weapons.

— Luis Walter Alvarez