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PAUL WALLICH is a staff writer for 大眾科學.

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This article was originally published with the title “Your First 20 Free!” in 大眾科學 Magazine Vol. 282 No. 2 (February 2000), p. 38
doi:10.1038/scientificamerican022000-3LeQIdpiNHPzcPgAumP2Qk

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