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If you’ve ever been to a high-school science fair, you probably know that citrus fruit can produce electricity. DDB Paris put that knowledge to clever use recently with an electric Tropicana billboard that was completely powered by oranges. Working with London production house Unit9, DDB attached 2,500 oranges to two big slabs of wood fitted with spikes of zinc and copper. The acidic juice of the oranges dissolved the metals, causing their electrons to react with each other and create an electrical current.
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