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Listen to the beat of gravity. By taking two strings with weights tied to them at different, yet uniform intervals, you can hear the uniformity (and rhythm) of gravity's accelerating pull.

1 cent - $1 per student Ages 6 - 14 Under 5 minutes
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Create an instrument that you don't play--you just listen to it through tubes of various lengths.

1 cent - $1 per student Ages 4 - 14 5 to 10 minutes