What's the most useful language?

Related questions

1. Is the Czech language hard to learn?
2. How difficult is it to learn Polish?
3. Is Prague safe to visit alone?
4. What country is Bohemia now?
5. Why is it called bohemian?
6. Is Polish different from Russian?
7. Are Polish and Russian related?
8. Where do Czech people originate from?
9. Is Czech Republic a poor country?
10. How many words are in the Czech language?

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14. #extent
15. #people
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18. #languages
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20. #making
21. #essentially