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The evolution of those annoying online security tests
http://www.bbc.co.uk/news/magazine-18367017
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A free tutorial website, Duolingo, aims to translate the entire web with the help of people starting to learn a new language. It's a project born out of guilt from the man behind one of the most annoying features of web surfing - those online security checks involving random words.
Duolingo hopes to convince millions of people to work for free and thus translate all web content in a matter of years.
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Quote:
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As a 22-year-old graduate student in 2000, von Ahn invented the Captcha - those distorted images of words and numbers used to sign in to ticketing and social media websites, among others, which users have to decipher to prove they are human.
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An interesting article-worth a read. 
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