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  1. World's Lightest Solid (Why it's impossible to burn or freeze it?)

    World's Lightest Solid (Why it's impossible to burn or freeze it?)

    10
  2. World's Lightest Solid (Why it's impossible to burn or freeze it?)

    World's Lightest Solid (Why it's impossible to burn or freeze it?)

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  4. The COLDEST Places On Earth: 99.9999% can't survive

    The COLDEST Places On Earth: 99.9999% can't survive

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