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Continue to ChatTogether with my advisor, Manuel Blum, I co-invented CAPTCHAs, or computer-generated tests that humans are routinely able to pass but that computers have not mastered (they are the squiggly computer letters that are prevalent across the web). - Luis von Ahn from https://whatsmyquote.com/quote/together-with-my-advisor-manuel-blum-i-co-invented-captchas-or-computer-generated-tests-that-humans-are