I think the known ones were previously decoded by humans not machines. I could b... | Hacker News

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		sh1mmer on Nov 23, 2008 \| parent \| context \| favorite \| on: ReCAPTCHA: simultaneously protecting against bots ... I think the known ones were previously decoded by humans not machines. I could be wrong. But that would make it a bit crap as you say.

aneesh on Nov 23, 2008 [–]

"The user is then asked to read both words. If they solve the one for which the answer is known, the system assumes their answer is correct for the new one."

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