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Burger chalk drawing on an A-frame advertising hoarding outsde a fast food outlet Stock Photo - Alamy
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CNN on X: "Why are the world's best mathematicians are hoarding chalk? 🎧 LISTEN to this story on CNN's new podcast, Great Big Story: https://t.co/65gmSbNBDl READ: https://t.co/09e16lyW3D https://t.co/kZ154rMmVc" / X
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