Word: captchas
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...weird little task: look at a picture of some wavy, ghostly, distorted letters and type them into a box. Sometimes you flub it and have to retype the letters, but otherwise you don't think about it much. That string of letters has a name; it's called a CAPTCHA. And it's a test. By correctly transcribing it, you have proved to the computer that you are a human being...