the greatest inventors

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Across
  1. 7. discovered by Alexander Fleming
  2. 11. William Cullen
  3. 12. Thomas Edison
  4. 14. patented by Nikolaus Otto
  5. 15. tamed by hominis in kenya
  6. 16. invented 3.500 before christ
Down
  1. 1. Johanes Gutenberg
  2. 2. Roger Bacon
  3. 3. Chinese
  4. 4. invented by Alexander Graham Bell
  5. 5. by the Romans
  6. 6. Gaston Plante
  7. 8. Francisco Fermi
  8. 9. Romans 2.000 ago
  9. 10. invented by Santos Dumont
  10. 13. Tim Berners Lee