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    That’s mostly technobabble in that quora answer.

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      I was actually linking the answer by Oliver Emberton, which was on top at the time (#2 right now). Sorry for that.

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        I agree… I was hoping for something interesting, not a patent promotion.

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        1. Whenever I’m not a CAPTCHA site, I manage to convince the site that I’m human the the first 2-3 times, then it just assumes I’m a bot. Maybe it’s also Google punishing me for my ad blocking.
        2. I would most certainly not want to have a system that would require me to use the accelerometer, that would just be annoying, and I don’t even know what that would mean for Desktops?
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          Not sure if it’s appropriate to post this so apologies if not - there’s an excellent little video of a (physical) robot ticking the box (and it works): https://www.youtube.com/watch?v=fsF7enQY8uI