But before taking the money, the Web site might first present the reader with two sets of wavy, distorted letters and ask for a transcription. These things are called Captchas, and only humans can read them. Captchas ensure that robots do not hack secure Web sites.
What Web readers do not know, however, is that they have also been enlisted in a project to transform an old book, magazine, newspaper or pamphlet into an accurate, searchable and easily sortable computer text file.
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