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In this activity, learners use cardboard bases and track tubes to make a ball run to explore the properties of mass, force, and motion.

Learners observe and discuss a simple model of a wet scrubber, a device for cleaning industrial air pollution.

With a bit of PVC, a laser, a can/cup, and a small mirror, you can make a device that visualizes you voice or any sound transmitted into the cup/can.

Learners build models of sinkholes to gain an intuitive knowledge of their physical aspects.

In this tabletop activity (on pages 32-40), learners make Möbius strips -- 3D surfaces with only one side.