A light switch is the simplest of electrical devices. Flip the switch, electricity flows. Flip it again, electricity stops. Lights on, lights off. That’s great for a small room with one entrance.

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PITTSBURGH, Sept. 27, 2024 /PRNewswire/ -- "I thought there could be a better way to power lights using a 3 or 4 way light switch," said an inventor, from Willet, N.Y., "so I invented the 3 OR 4 WAY ...