Lesson 10: Vocabulary

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Across
  1. 2. The invention of the _______ fan helps us to stay cool in hot weather
  2. 4. Scientist may test their ideas in a _____, using special equipment.
  3. 6. The lightbulb was an ___________ that helped people do things at night.
  4. 7. A red light is a _____ to stop. This invention helps to save lives.
Down
  1. 1. A good invention has an ______ problem but should not fail regularly.
  2. 2. First, an inventor must perform an ______ to test an idea.
  3. 3. A small ____ with many parts, such as a watch, can be hard to repair.
  4. 5. Although Einstein acted silly, he was known for his great mind, or _______