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You can purchase a "Radiometer" or Solar Spiner which is like a solar sail in a bottle....sorry, you cannot view external links. To see them, please
REGISTER or LOGINIt has 4 little tabs, one side painted black, one side painted white. And, the color difference is enough to make the top spin in the sunlight.
Except that it ["Radiometer" or Solar Spinner] rotates in the wrong direction