Useful inventions Laia and Dídac.

1234567
Across
  1. 1. an object which some people can't see without
  2. 3. this inventor created an object that can be used for both saving and amusement
  3. 5. almost everyone us this to get around
  4. 7. people who have to undergo surgery are injected with it.
Down
  1. 2. he invented things that are still used today, such as the law of hydrostatics
  2. 4. a device which people use to communicate
  3. 6. his wish whose the end of the war