LIFE'S GREAT MYSTERY

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Across
  1. 2. hypothesis
  2. 8. strange
  3. 9. eerie
  4. 11. receive from previous holder
  5. 13. ghostly
  6. 14. watch something very carefully
  7. 15. look into
  8. 18. funny
  9. 19. uncommon
  10. 20. proof
  11. 21. extraordinary
Down
  1. 1. studies human histories
  2. 3. trick
  3. 4. puzzled
  4. 5. finding answer
  5. 6. legend
  6. 7. student of history
  7. 10. show something true
  8. 12. soul
  9. 16. found
  10. 17. vanish
  11. 22. extraterrestrial