The Hottest Education Startup in the U.S. is a $700 Million Company Built by a Guatamalan Engineer in Pittsburgh

Duolingo, which built a big business on a free app,may file to go public in 2020. If and when it does, the startup will give Pittsburgh a hu...

Duolingo, which built a big business on a free app,may file to go public in 2020. If and when it does, the startup will give Pittsburgh a huge homegrown success story.

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