inventions and discoveries

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Across
  1. 3. Robert Nevellis invented it in the 19th century. You love this invention!
  2. 5. Thomas Edison invented it in 1879.
  3. 6. It was discovered in the early Stone Age.
  4. 7. Karl Benz invented it in 1886.
  5. 9. Alexander Graham Bell invented this in 1876.
Down
  1. 1. Isaac Newton discovered it in 1666.
  2. 2. Martin Cooper invented this in 1973.
  3. 4. Thomas Savery invented it in 1712.
  4. 8. Joseph Priestly discovered this in 1774.