Elliott, left, and Sam Coffey race marbles on their Space Racer Marble Run. Elliot Coffey races marbles on his Space Racer Marble Run. Elliott, left, and Sam Coffey race marbles on their Space Racer ...
My family is fascinated with marble runs and the like. The last time we went to the DuPage Children's Museum, we watched their kinetic ball sculpture - which looks like a complicated marble run - for ...
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