C APTCHAs – those weird, distorted words that prove you’re human before you buy overpriced tickets to Adele’s upcoming tour. You know ’em, I know ’em, some people call them reCAPTCHA, but none of us like ’em. They’ve been around a while now and until a couple weeks ago I dismissed them as a neat, annoying idea to prevent bots and scammers from running wild on the interwebs. But here’s the surprise kicker: a lot of times the CAPTCHAs are actual words from actual text. My five seconds of attention combined with the five seconds of attention of everyone else unwittingly adds up to a boatload of computing power. This is old news for some but I sure as sh*t didn’t know about it. Here’s the story of how it all got started and the certified genius who made it happen. The problem In 2000, 22-year-old Luis von Ahn was a graduate student at Carnegie Mellon. He worked alongside his professor, Manuel Blum, on developing a test that humans can pass but not computers. One practical application being...
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