Young Thomas Edison

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Across
  1. 3. A small, useful machine or device
  2. 4. Happening from time to time
  3. 6. A place where scientists work and do experiments
  4. 7. A test to find out or prove something
Down
  1. 1. Powered by electricity, a form of energy caused by the motion of electrons and protons
  2. 2. A sound, motion, or other sign that sends a message
  3. 3. Extraordinary intellectual power, especially seen in the creative ability
  4. 5. An original device, system, or process