Once upon a time there was a magnet, and in its close neighborhood lived some steel filings. One day two or three little filings felt a sudden desire to go and visit the magnet, and they began to talk of what a pleasant thing it would be to do. Other filings nearby overheard their conversation, and they, too, became infected with the same desire. Still others joined them, till at last all the filings began to discuss the matter, and more and more their vague desire grew into an impulse. “Why not go today?” said one of them; but others were of opinion that it would be better to wait until
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