十万个为什么·科学阅读30篇（3）
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Why Do Snowflakes Always Have Six Sides?
为什么雪花总是有六个边？
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Every snowflake starts as a tiny ice crystal around a dust particle.
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Water molecules freeze in a hexagonal pattern because of their shape and bonds.
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This six-sided symmetry repeats as more water vapor joins the crystal.
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Tiny changes in air temperature and humidity make each flake unique.
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No two snowflakes are exactly alike, but all share the same basic six-fold design.
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You can see this pattern best with a magnifying glass on fresh snow.
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Even broken flakes often show parts of the original six-arm structure.
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The hexagon shape is nature’s most efficient way to pack ice molecules tightly.