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In winter, tiny, pure white shapes drift down from the sky: snowflakes! Each one is so beautiful that some sparkle like stars while others appear as delicate needles. But the most astonishing thing is this: no two snowflakes on Earth are exactly alike. How Do Snowflakes Form? The journey of a snowflake begins inside clouds. Water vapor in the air freezes in very cold conditions and turns into tiny ice crystals. As these crystals drift within the cloud, they collide and stick together. Each added