Moon Phase, Water Pressure, and more. With a tabletop planetarium Mr. Wizard and Shan revue the motions of the Earth and Moon as they revolve around the Sun. In this episode, Mr. Wizard shows Moon Phase, Water Pressure, Blue Grouse, Buttons on a String Puzzle, Stomach Acid Color Changes, Garden Hose Mystery, Hovercraft, Washer on String Off Finger, and Estimating Balls.