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There are many small gadgets that require a cell battery in order to operate. However, here four useful gadgets that only need a single AA battery.

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Four small, probably rocky planets orbit Barnard’s star (illustrated). The planetary system is the nearest one to the sun centered on a single star.

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A single small unit produces 0.4 volts - about a quarter of the voltage of a AA battery. When researchers connected 15 units together, they generated enough electricity to power LED lights directly.