Have you started seeing images in online <a href="http://www.google.com/recaptcha">reCAPTCHAs</a> that look suspiciously like house numbers pulled from Google Street View? Well, as it turns out, that
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Captchas are well known for keeping automated spammers out and letting humans in. However, ReCaptcha is a rather clever service using them to help digitize books scanned into the Internet Archive as w