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Uranium glass marbles | Boing Boing
Marbles, a sample of the element Uranium in the Periodic Table
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Received some marbles as a gift. They seem a little darker than normal uranium glass but still fluoresce. The larger darker red marbles fluoresce too although it's hard to see in the
Radioactive Uranium Marbles
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A Uranium Glass Marble Ring Oscillator for Your Next Steampunk Project - Hackster.io