Captchas are well known for keeping automated spammers out and letting humans in. However, ReCaptcha is a rather clever service using them to help digitize books scanned into the Internet Archive as well. It’s a project from the School of Computer Science at Carnegie Mellon. The Internet Archive is home to over 200,000 scanned copies of classic books. Some of them are gorgeously crafted, like this children’s book, but fancy styling can make it difficult for computers to translate the books into an indexable digital text. Much like a Mechanical Turk application, ReCaptcha uses humans to translate images of scanned ...

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