Birthday Puzzle

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Across
  1. 1. used by early humans for tools and shelter
  2. 3. To alter the past
  3. 4. Nick's birthday month
  4. 5. A share of ownership in a corporation
  5. 7. largest planet in our solar system
  6. 8. age, when woolly mammoths roamed the earth
  7. 11. Name for the people who panned for gold
  8. 13. tool that helped separate gold from dirt
  9. 15. the length of a bridge between two piers
  10. 18. A large telescope in space
  11. 19. A paradox created by time travel
Down
  1. 1. Mel Brooks very funny Western spoof
  2. 2. Nick's birth state
  3. 6. River on the east border of Iowa
  4. 9. University of Iowa mascot
  5. 10. Only U.S. President from Iowa
  6. 12. small chunks of pure gold
  7. 14. Nick's birthday day
  8. 16. president during the California gold rush
  9. 17. Club used to put