Chemistry
3 questions
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What is glass?
Window glass looks solid and behaves like a solid, but its atoms are arranged like a liquid's. Why does a liquid stop flowing without ever crystallising?
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Why do some materials superconduct at high temperatures?
Some ceramics carry electricity with zero resistance far above the limits once thought possible. Forty years on, we still don't know how.
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Why does life use molecules of only one hand?
Chemistry makes left- and right-handed molecules in equal amounts. Life uses only one kind. Why, and how did it choose?