The Snowflake: Winter's Secret Beauty

National Geographic Snowflakes Pictures: Photograph 1 (winter, Christmas)
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Interesting snowflake patterns require cold weather. Temperatures 50 Fahrenheit (minus 150 Celsius) or colder produce particularly interesting results, according to snowflake expert and Caltech physics professor Kenneth Libbrecht.

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Photograph by and copyright Patricia Rasmussen, courtesy Voyageur Press
 
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