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The scoop on reCAPTCHA founder's new startup Duolingo.
(
tedxcmu.com
)
84 points
by
gregg1982
on April 26, 2011
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34 comments
Watch TEDxCMU LIVE
(
tedxcmu.com
)
12 points
by
atambo
on April 4, 2010
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1 comment
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