SCI-FUN's Christmas Card
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Real snowflakes exhibit a hexagonal structure because the water molecules in ice have a tendency to stack together in the form of a regular crystalline lattice, which exhibits six-fold symmetry. (Of course, the phase change of liquid water ice is a form of symmetry breaking – liquid water exhibits a much higher degree of symmetry. (Broadly speaking, a blob of water looks the same from every direction...) |
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There's an excellent microscopy primer at the Molecular Expressions site, with information on equipment and techniques. The image shown here and on the card is copyright Molecular Expressions, and is used with their permission. |
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