Real Multitasking, or Web Security Words Help Digitize Old Books (NPR)

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All Things Considered, August 14, 2008 · People who use the Internet to talk to friends, set up free e-mail accounts or buy concert tickets are often unknowingly helping to digitize vast libraries of old books and newspapers.

That's because more than 40,000 Web sites — including popular ones such as Ticketmaster, Facebook and Craigslist — are using a new kind of security program called reCAPTCHA. more>>