In the course of its life span,a snow-crystal might flutter through many warmer and colder pockets,acquiring a complicated and unique growth history.Such a history will give rise to a snowflake that is unlike any other.Each arm on the snowflake will look exactly like every other one,but the crystal itself will be one of a kind.
Using his cooling tanks,Libbrecht has learned how to create snow crystals of different shapesplates,colhuns,needles etc.Libbrecht has even refined his techniques so that he can make crystals that look highly similar to one another.Still,he lacks the control to manufacture identical twin snowflakes.A slight difference in humidity and temperature can upset the growth profile of a crystal.
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