The secret history of popcorn

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Across
  1. 2. because of
  2. 3. jumping
  3. 7. shielding
  4. 8. strong
  5. 11. exploding
  6. 12. seeds
  7. 14. different types
  8. 15. indigenous people
Down
  1. 1. discovered
  2. 4. very old
  3. 5. accomplishment
  4. 6. person who studies human history
  5. 8. mysteries
  6. 9. very fast
  7. 10. resolve
  8. 13. light meal or refreshment