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Twitter 上的 Question of the Day:"(1/2) On Friday we asked, “Which item commonly found on the beach is used to make glass?” Water, clam shells, sand, or seaweed? #trivia #science #glassmaking #glass #
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How to Make Glass (with Pictures) - wikiHow
Can you turn glass back into sand? | BBC Science Focus Magazine
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Researchers have discovered how to make concrete from recycled glass - by turning it back into sand | Fox News