Invention

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Across
  1. 2. a room or building for scientific work
  2. 4. something which provides active acquired immunity to a particular infectious disease
  3. 5. a wall built across a river to stop the flow and collect the water
  4. 6. a person who create new things
Down
  1. 1. a device for taking photographs or making films or television programmes
  2. 3. a piece of kitchen equipment that uses electricity to preserve food at a cold temperature