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Spinning Blackboard
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Create beautiful spirals by drawing a straight line. This sounds crazy, but you can with a turntable (a record player or lazy susan), paper, and pen.

Non-Round Rollers
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Wheels aren't the only things that can "roll" objects that are placed on top of it. Make non-intuitive shapes from cutouts and a compass to demonstrate this.

Radioactive-Decay Model: Substitute coins for radiation
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Get a roll of pennies, throw them on the ground, then remove those that only show tails, and repeat with the ones left over.