Fruit Powered Clock.

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A digital clock and calendar powered by food! This fruit powered digital clock and calendar combines micro-electronic technology with the natural electrical potential of a fresh fruit or vegetable. The Fruit Clock uses the original scientific principles on which all modern electrical storage batteries are based. Just add a fresh orange, apple, lemon, lime, pear, banana, or any another convenient fruit or vegetable to the supplied components in this kit and you have the perfect synthesis of nature’s own electrical power resource and the accuracy of a digital clock.

Link -via Everlasting Blort

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This is a pretty old thing... I remember everyone had a fruit clock about eight years ago... In my experience they worked fairly well, especially with citrus fruits. At least until the acid from the fruit started to corrode the metal prongs.
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I used to own a "Two Potato Clock" back when I was a kid. It would run on potatoes, oranges, even water. It was fun for about a week, or until the potatoes really began to stink.
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