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About the Cover

Cover Figure


COVER Millions of books written before the computer era are being digitized for preservation. Because the ink has faded, optical character recognition software cannot decipher many words. Through a repurposing of an existing online security technology called CAPTCHA, these words are being manually transcribed by millions of Web users. See page 1465. Photo: Joshua Franzos

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Science. ISSN 0036-8075 (print), 1095-9203 (online)