Captcha History from PARC.

That thing is called a CAPTCHA.

The Captcha Project Inaccessibility of CAPTCHA Alternatives to Visual Turing Tests on the Web, a W3C Working Group Note.

Imagine you're using the Internet and you see a CAPTCHA that you think is somewhat peculiar, like this CAPTCHA.

While you're typing a CAPTCHA, during those 10 seconds, your brain is doing something amazing.

Then of course, you fill out the CAPTCHA because you help us digitize a book.

And basically, since we released it about three or four years ago, a lot of websites have started switching from the old CAPTCHA where people wasted their time to the new CAPTCHA where people are helping to digitize books.

See here's the thing, each time you type a CAPTCHA, essentially you waste 10 seconds of your time.

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(Laughter) CAPTCHA Project is something that we did here at Carnegie Melilon over 10 years ago, and it's been used everywhere.

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