Ok, so your rich uncle has collected everything but the kookiest kitsch. Please him with the lovely handcrafted Clear Bowl Radiometer ($69). This thing turns in sunlight, and the stronger it is, the faster it goes. That's really something!
People didn't always know about the wonders of solar power, ya know. English physicist Sir William Crookes discovered it (along with thallium and helium), and before we understood it, solar wind was a hotly debated controversy. Light mills are a novelty now, but they used to be serious science fare.
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