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"  1. If there are already four or five people gathered on the ice in one place, then you can be pretty sure youll be okay. Unless theyre all named Jesus.  2. If theres no one else out there, find something really heavy -- a convenient rock or log -- and throw it onto the ice and see if it cracks or shifts.   3. If nothing happens, stare at it. Really stare. If it is milky and has lots of air bubbles in it, it is nowhere near as strong as if it looks like a windowpane. And if you do see air bubbles, make sure they go down at least four inches. Thats the minimum depth requirement for safe ice. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.esquire.com/news-politics/a4016/safeice0108/>