Using traditional heuristics, policemen can spot any dead volcano -- as long as it never decides to trap them in.

     Is there no other way out? Take the police as an example. Using traditional heuristics, policemen can spot any dead volcano -- as long as it never attempts to look alive. But believers try to make it look so by erupting at his side. In fact, the situation gets worse each time one of them erupts! In rare cases, everything erupts!