Snowflake pictures by Caltech expert featured on Swedish stamps
Professor Ken Libbrecht is one of the world's top experts on snowflakes and ice crystal formations. He is also an avid photographer. The snow crystals featured on the winter holiday stamps were taken by Libbrecht in northern Sweden.
His regular job in the lab is to study and grow ice crystals from water vapor to create synthetic snowflakes.
"To capture the characteristics of each crystal, I have developed a special microscope that allows me to add back lighting," Libbrecht said in a statement Wednesday. "The snow crystal functions as a complex lens that reflects light, resulting in beautiful coloring effects."
-- Ching-Ching Ni
Image: Stamps from Sweden featuring photos by Caltech physicist Ken Libbrecht. Credit: California Institute of Technology