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In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern.

$5 - $10 per group Ages 11 - 18 1 to 2 hours
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In this physics activity, learners recreate Galileo's famous experiment, in which he dropped a heavy weight and a light weight from the top of the Leaning Tower of Pisa to show that both weights fall

Over $20 per group Ages 8 - 18 10 to 30 minutes
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In this physics activity, learners assemble and/or investigate a pendulum "snake." Several large steel hex-nuts are suspended on strings of successively increasing length to form a series of pendulums

$10 - $20 per group Ages 8 - 18
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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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Walk a toy to the edge of its doom, maybe it'll fall off the edge of a table, but it will safely stop right before falling.

free Ages 6 - 14 Under 5 minutes
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In this activity, learners make a simple spring-like scale using a rubber band instead of a spring, and calibrate the scale in newtons (N).

$1 - $5 per student Ages 11 - 18 30 to 45 minutes