Inventions and discoveries

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Across
  1. 1. to not have something, or to not have enough of something.
  2. 5. the largest in amount, size or number that is allowed or possible.
  3. 9. to stop working (for a machine).
  4. 10. the detailed study of something in order to discover new facts.
Down
  1. 2. not natural or real, but made by people.
  2. 3. not the same as anything or anyone else.
  3. 4. This phone is ___. We have to find another one.
  4. 6. happening very quickly without any signs.
  5. 7. I’ve a ___ of books about horses.
  6. 8. to design or create something that did not exist before.