As we developed websites and apps, others developed automated programs, or bots, to infiltrate them, sometimes to hack, but mostly to spread spam or skew statistics. So developers came up with Turing tests called CAPTCHAS to eliminate non-human users. But the bots got better, and so the tests had to get better. This video is barely over five minutes- the rest is an ad.
Oh dear, I don't know what happened to the video! I must have been in a rush. Thanks for the heads up... I have it here now!
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