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Never seen this one before...

Just came across a website that asks you an addition math problem to prevent bots. Except it's always adding two single digit numbers. And they are always 2 and 9...

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    The weirdest "I'm not a robot" implementation I've seen was a simple slide switch. It read "I'm a robot" on red and changed to green when slide it all the way to the other side. It was pretty cool; I don't know about accessibility though.
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