Luis von Ahn
The guy who came up with capchas. His next idea was to use them to digitally scan books. When you have two words, one is known to the computer and the other is the scan. Average the scan word over 10 respondants to get the "correct" interpretation.
His next project: Duolingo. You learn a language for "free", and in the mean time translate the internet. The key is to average user interpretations to arrive at a correcdt translation.
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