Just for fun: Digitizing books with reCAPTCHA
Luis von Ahn of Carnegie Mellon not only invented captcha (those exasperating squiggly words that tell websites you are a human), he reinvented it. ReCaptcha is now a tool for digitizing books. Ever since I learned that, I've found them much less annoying. Well, okay, a bit less annoying.
Here's an excerpt from NOVA ScienceNow explaining reCaptcha.
You can watch von Ahn's TED talk here.
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