With his camera and sock, Colorado doctor captures stunning uniqueness of snowflakes

Jason Persoff’s neighbors probably have some questions. When it snows, Persoff is often out on his front porch, standing still with his arms out straight, holding a dark black sock out into the snowfall. “It is, admittedly, a little odd,” said Persoff, the assistant director of emergency preparedness at the University of Colorado Hospital [and associate professor of medicine at CU School of Medicine].