Young Thomas Edison - Vocabulary

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Across
  1. 2. a small machine or tool that is useful.
  2. 3. a sound, a movement, or another sign that sends a message.
  3. 5. sometimes but not very often.
  4. 6. something new that someone thinks up and creates.
  5. 7. a test that helps scientists answer their questions.
Down
  1. 1. runs by electricity.
  2. 2. being very smart.
  3. 4. a place where scientists work and do experiments.