What do you know about the Snowball Earth?

Consider this an informal poll – does the phrase “Snowball Earth” mean anything to you?
This is more aimed at those amongst my readership who are not professional rock-hounds. Also, “no” is an entirely acceptable answer: it’s the one I’ve got from virtually everyone I’ve tried to explain my new research to thus far – hence the question, since I thought that at some level it had gained a little traction in the public consciousness. If I was wrong, that’s an important thing to know.