Congrats to @LuisvonAhn on receiving the Lemelson-MIT Prize. You and your team at @Duolingo have done an incredible… twitter.com/i/web/status/1…

Congrats to @LuisvonAhn on receiving the Lemelson-MIT Prize. You and your team at @Duolingo have done an incredible… twitter.com/i/web/status/1…