Take this radiometer for a spin in a sunny spot and watch thermodynamics in action. Once it soaks up some rays it becomes a real solar engine. The stronger the light, the faster it spins!
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Small: 6.5 inch in Height; Large: 7.6 inch in Height;
Mine took around a month to ship for some reason, and only shipped once I inquired about it. It works nicely and it's cute but at $42 I do think it is quite overpriced and feel a bit foolish for paying that for it.