so I was watching the weather channel last night and they had a show about facts of earth. They were talking about the water cycle and rain. They did a cool experiment with pure water that was 20 degrees F it was not frozen but as soon as a culture of this bacteria was added it completely froze solid. I did a little research and found this article that explains it pretty well. If we could only culture that stuff we could get ice even sooner
but I guess we should all thank the little creatures as they speed up ice formation
http://www.wired.com/science/planetearth/news/2008/02/bacteria_clouds