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Learners use a commercially available toy to experiment with density. They fill a chamber in the toy submarine with baking powder and release it into a tank of water.

$1 - $5 per group Ages 4 - 14 5 to 10 minutes
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This activity (on page 2 of the PDF) features a recipe to create the stretchy polymer Flubber from Borax detergent, white glue, and water.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes