Impossible Crossword

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Across
  1. 2. founder of microsoft
  2. 5. 3.14
  3. 9. scientist that discovered gravity
  4. 10. tallest building in the world
  5. 13. close working relations between person and organization
  6. 14. lincolns killer
  7. 21. bad guy in star wars
  8. 22. express sharp disapproval
  9. 24. lord of the rings author
  10. 26. what does the 'D' in D-day stand for
  11. 27. writer of the Iliad
  12. 29. president on the 20
  13. 31. crossword aficionado
  14. 33. Massachusetts Institute of Technology
  15. 35. narrow land strip with water on each side
  16. 37. president during watergate scandal
  17. 39. two opposite meanings
  18. 40. PfeffErminZ
Down
  1. 1. libraries usually
  2. 3. the youngest country
  3. 4. singer of Purple Rain
  4. 5. word or phrase that is the same backwards and forwards
  5. 6. Government in the U.s.
  6. 7. vice president under Chester A. Arthur
  7. 8. Free Application for Federal Student Aid acronym
  8. 11. Tv judge
  9. 12. easter island statues
  10. 15. what is the longest color wavelength
  11. 16. hi in vietnamese
  12. 17. sun centered
  13. 18. pocket square simply
  14. 19. author of The Bells
  15. 20. Ohio state buckeyes mascot
  16. 23. religious song or poem
  17. 25. National Oceanic and Atmospheric
  18. 28. star name pronounced like 'beetle juice'
  19. 30. Islamic State of Iraq and Syria
  20. 32. first man on the moon
  21. 34. sea plant
  22. 36. pregnant goldfish
  23. 38. Al qaeda terrorist