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The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
-- Isaac Asimov
He who knows not and knows that he knows not is ignorant. Teach him.
He who knows not and knows not that he knows not is a fool. Shun him.
He who knows and knows not that he knows is asleep. Wake him.