Whether or not you know the name, you've encountered a CAPTCHA before. It's the little window typically found at the bottom of an online registration form that's meant to separate real people from robots or scripts that could potentially flood a site with phony accounts and fraudulent purchases. reCAPTCHA is a Google-owned implementation that you've probably seen across the web, and convincing it that you're a real person usually consists of squinting at a set of funky letters and re-typing them as best as you can.

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