I have learned from watching the two videos that when you stand something up like a domino, you store energy and when you tip it over you release its energy. The bigger and heavier the object, the more energy it stores and release. I also learned that a chain reaction machine may look complicated but when you look at it step by step, it’s very simple. When you’re creating a chain reaction it’s easier to start off at the end than the beginning. It’s like writing a story, you know the ending, so you can write the whole story leading up to the end.