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Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.

$1 - $5 per group Ages 11 - adult 30 to 45 minutes
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In this activity, learners combine two substances (plaster of Paris and water) to make a cast of an object's imprint in clay.

$1 - $5 per student Ages 6 - 14 30 to 45 minutes