Andrew on his bicycle meets Mr. Wizard who has him mark a section on the front wheel with a piece of tape. Andrew turns the wheel until the marked section is on the ground. Mr. Wizard explains Wheel Travel Part 1&2, Torque Rod, Balance, Hinged Stick & Ball, Tie a Bone Into a Knot, Orange Juice Canon, Circumference Puzzle, Coloring Carnations, Ice Age, and Sodium Metal