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Can you light up a room with just five cents? A battery is a device that converts chemical energy into electrical energy. This activity, developed and demonstrated by Julie Yu, director of the Exploratorium Teacher Institute, shows you how to build a battery strong enough to power an LED for a whole day—using nothing more than a few pennies and a salty solution. Watch the videos to learn how to build a battery of your very own, and light the way for other chemistry lovers.

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