Frazil ice. What the heck is that? If you've been to Yosemite National Park in the past couple of weeks, you might know. If not, check out this video by Steven Bumgardner.
Steve is the video-meister at Yosemite, though he occasionally travels to other parks to capture and explain nature. This program on frazil ice is one of many he produces for Yosemite Nature Notes.