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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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Learners make a refrigerator that works without electricity. The pot-in-pot refrigerator works by evaporation: a layer of sand is placed between two terra cotta pots and thoroughly soaked with water.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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Learners build models of sinkholes to gain an intuitive knowledge of their physical aspects.

$1 - $5 per group Ages 8 - 11 10 to 30 minutes