bookcases, you want to secure those; right? this is what's going it happen. if you as nerts you went in there and got a report that there may be people trapped, where would you start looking for them? upper floors and void spaces. again, we talked about glass. are these people a little too close, do you think? did they give you a rule of thumb how far away to stay from buildings. well, actually 1 1/2 times the height of the building. so if you are in a 30-foot building -- you already did the math -- you want to be 45 feet away. glass falls out, too, do you think it just falls straight down? no, it kites its way around. it can kite up to two blocks away. be aware of that, got your helmet on. types of hazard, you have above ground, ground and below ground. what's an above ground hazard? glass, wires, falling objects. some of the ground level hazards are glass. what's bad about uneven surfaces that are slippery? we already talked about that. you fall, you're going to hurt yourself. is water a bad thing to have? water seeks its own level, there's a hole, covering