Callum's Crossword

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Across
  1. 4. Best seeling book of all time
  2. 5. Surname of world's richest man
  3. 7. WBC heavyweight boxing champion
  4. 9. Bilogical process that sets itself naturally to a 24 hour cycle
  5. 10. Spirit in blue lagoon
  6. 11. Animal on Porsche logo
  7. 12. Finland capital
  8. 15. Largest waterfall in the world
  9. 16. President of the US 1987
  10. 19. Owner of Tesla
  11. 21. Main source of vitamin C
  12. 22. Who was I in the movie 'I am a legend'
Down
  1. 1. First name of the English monarch ruling in 880
  2. 2. In which month did Japan bomb Pearl Harbour
  3. 3. Football team based in Birmingham
  4. 6. Piece in chess worth five points
  5. 8. Korean tech company
  6. 13. Country with most Fifa world cups
  7. 14. Dubiousness
  8. 17. Largest county in England
  9. 18. Geiger counter measures
  10. 20. Band that sang 'live forever'