The world's greatest inventions

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Across
  1. 3. It was invented in 1903 by the American Wright brothers, brought the world closer together
  2. 5. Navigational device
  3. 9. A system of communication consisting of sounds, words, and grammar
  4. 10. A medicine or chemical that can destroy harmful bacteria in the body or limit their growth
  5. 11. A circular object connected at the centre to a bar, used for making vehicles or parts of machines move
Down
  1. 1. It was discovered rather than invented,gave us warmth, protection
  2. 2. A portable device first invented in 1992
  3. 4. It is responsible for eradicating diseases and extending the human lifespan.
  4. 6. It was invented about 100 BC in China, allowing us to write down and share our ideas.
  5. 7. A short, thin stick made of wood and covered with a special chemical at one end that burns when rubbed firmly against a rough surface
  6. 8. The large system of connected computers around the world that allows people to share information and communicate with each other