What is the most efficient language?

Related questions

1. What is the net worth of Google?
2. What are the benefits of duolingo plus?
3. Can you reset duolingo progress?
4. How many levels are there in Memrise?
5. Is Italian a useful language?
6. Can duolingo teach you Japanese?
7. How much does Memrise app cost?
8. Is duolingo Spanish Good?
9. Is it bad to listen to music while you sleep?
10. Does Memrise help you learn a language?

Tags

1. #christophe
2. #spoken
3. #french
4. #seven
5. #single
6. #survey
7. #travel
8. #speech
9. #english
10. #marsico
11. #determine
12. #world
13. #italian
14. #egidio
15. #languages
16. #pellegrino
17. #every
18. #researchers
19. #information
20. #process
21. #university
22. #language
23. #above