Planet Earth: An Illustrated History

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.

• The Book, "TIME Planet Earth: An Illustrated History"