
A Carnegie Mellon University scientist, Luis von Ahn, calculated that people waste close to 500,000 hours every day typing these characters. Luis von Ahn consequently developed reCAPTCHA which connects all of this immense brain power to help digitize old books and he and his colleagues reported in Science that “over the last year Web users have transcribed enough text to fill up more than 17,600 books, with better than 99 percent accuracy.”
To read/listen to the story visit http://www.npr.org/templates/story/story.php?storyId=93605988.
To learn more about reCAPTCHA visit http://www.captcha.net/.
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