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Pot-in-Pot Refrigeration

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In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.
$1 - $5 per student Ages 8 - 18 1 to 2 hours

Crystal Creations: Grow Spikes of Crystals in the Sun

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This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.
$1 - $5 per student Ages 6 - 11 1 to 2 hours