Imagine this: you are riding an escalator packed with people and it suddenly speeds up. Then, without warning, it abruptly stops! People go tumbling down the escalator into a massive pile up that causes many injuries. This is a real situation that has happened before. Watching this video, produced by National Geographic, will give you the best option for avoiding disaster and potential injury in an instance such as this. I am happy to announce that your author choose the correct option. Did you?