How do they do that?

Have you ever come across anything that someone has done that has made you wonder how on earth they had managed to do it? I've often wondered about how on earth window washers manage to clean the windows of high rise buildings, or how traffic controllers in airports manage to organize flights into and out of the airports so that all of the planes land and take off safely. There are jobs out there that we sometimes don't even realize exist, and the tasks involved in that job are either diffic...