Hard random knowledge

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Across
  1. 4. the great lake were Niagara Falls empties into
  2. 6. band that released the album "dark side of the moon"
  3. 7. body part where the smallest bone in the body is
  4. 11. the author of "To Kill A Mockingbird "
  5. 13. only country named after a woman
  6. 14. capital city of Bhutan
  7. 16. chemical symbol for gold
  8. 20. lead singer of Queen
  9. 21. only country flag with the colour purple
  10. 22. roman goddess of love
Down
  1. 1. artist who painted the ceiling of the sitting chapel
  2. 2. instrument that Yo-Yo Ma plays
  3. 3. only word with three double letters in a row
  4. 5. the only organ that can regenerate itself
  5. 8. currency of Japan
  6. 9. capital of Mongolia
  7. 10. least populated country
  8. 12. country who held the first ever Olympics
  9. 15. 2007 was the year in which this popular phone was first released
  10. 17. element with the atomic number 1
  11. 18. the African nation formerly known as Abyssinia
  12. 19. the mountain range that separates Europe and Asia