Crack the code

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Across
  1. 4. ... butter jelly time
  2. 6. Kart
  3. 8. 2 potions
  4. 12. a^2+b^2=c^2
  5. 13. 5-point star
  6. 14. What is someone with coulrophonia afraid of?
  7. 15. How many string does a guitar usually have?
  8. 16. Barbies boytoy
  9. 17. Gold
  10. 18. First country to send someone to space
  11. 19. How many time zones are there in Russia?
Down
  1. 1. 40 days after Easter
  2. 2. IPA
  3. 3. scooby
  4. 4. They speak this in curacao
  5. 5. Ross Geller
  6. 6. ... Jackson
  7. 7. Where does the mojito cocktail originate from?
  8. 9. Brie Cheese
  9. 10. Capital of Sweden
  10. 11. Fifth planet