How was Duolingo created?

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Tags

1. #duolingo
2. #macarthur
3. #really
4. #science
5. #believe
6. #grant
7. #founder
8. #people
9. #originally
10. #outlet
11. #education
12. #world
13. #change
14. #severin
15. #foundation
16. #project
17. #hacker
18. #supply
19. #switzerland
20. #sponsored
21. #national
22. #wanted
23. #fellowship