One cubic foot of gold weighs more than 1,200 pounds!
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Iron weighs more after it rusts.
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The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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Balsa wood is classified as a hard wood!
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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Aluminum used to be more valuable than gold!
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