Duolingo Raises $45 Million Series D Round Led By Google Capital, Now Valued At $470M
techcrunch.com/2015/06/10/duolingo-raises-45-million-series-d-round-led-by-go...
Duolingo, the free language learning service co-founded by reCAPTCHA inventor Luis von Ahn, today announced that it has raised a $45 million investment round..
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