invention - The Light bulb was an ______________________ that helped people do things at night., experiment - First, an inventor must perform an _________________ to test an idea., laboratory - Scientists may test their ideas in a __________________, using special equipment., genius - Although Einstein acted silly, he was known for his great mind, or _____________., gadget - A small ___________ with many parts, such as a watch, can be hard to repair., electric - The invention of the ________ fan helps us to stay cool in hot weather., signal - A red light is a ________________ to stop. This invention helps to save lives., occasional - A good invention has an _______________ problem but should not fail regularly.,

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