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When you are standing in a city like New York or Los Angeles its very easy to understand the importance of a practice like the grey man. You really need to be careful about what you do and where you do it, in times of disaster. This is particularly true in highly populated areas like NYC. Just the idea that you can make it out in one piece is a stretch. In a disaster scenario you want to get away from these crowded metro areas, ASAP. The only way that you can do it is to get through them, if you live there. You have to be very careful and thoughtful here.
The things you carry and the way you appear will make all the difference in this scenario. That is why articles like this one on the grey man theory will help you!