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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When I press the “on” button on the light switch for the chandelier over my kitchen island, it turns on in an instant. When I ask Alexa to turn it off, the light turns off. When I tap the light in the ...