momentum -- karate (use 1" pine #2 wood, either 6" x 12" or 12" x 12"
pieces)
pressure -- bed of nails
heat -- dry ice; liquid nitrogen; bottle rocket (ignite alcohol fumes in
5-gallon water bottle)
electricity -- van de graaff generator; tesla coil; microwave oven demos
(e.g., CD for 4 seconds)
sound -- flame tube; inhale helium
Simple (most of them), fun, educational, dramatic, memorable... Hope they
enjoy your show!!
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