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Every web surfer, has been forced to stop and perform this weird little task: look at a picture of some wavy, ghostly, distorted letters and type them into a box. By correctly transcribing it, you have proved to the computer that you are a human being.
The CAPTCHA caught on, and now it's all over the Web. Luis von Ahn, an assistant professor at Carnegie Mellon who was part of the original CAPTCHA team, estimates that people fill out close to 200 million CAPTCHAS a day. But you should pause…










