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I think Rube Goldberg machines are fun to watch. In third grade I made a small one for a science class about simple machines. All it did was throw a marshmallow across a room. The steps it took to throw the marshmallow were really complex, considering the task. My dad and I built it. That was really fun just by itself. We messed around a lot. When it was done we would see who could catch the marshmallow in their mouth first.