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Planet Earth: An Illustrated History
Kenneth Libbrecht / Visuals Unlimited / Getty
Snowflake
We've all heard that no two snowflakes are identical. The notion may be more poetic than scientific, but it effectively makes its point: that nature is both staggering in its diversity and remarkable in its precision. The geometry of snowflakes is a reminder that nature's actions, however unpredictable at times, are governed by basic laws of physics and mathematics.
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