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    The Exploratorium
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    In this activity, PVC pipe, plastic water bottles and vinyl tubing are used to make a simple working toilet model. The model shows the role of a siphon in the flushing of a toilet. Educators can...

    $10 - $20 per group Ages 8 - 18
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    Science Museum of Minnesota
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    Learners will construct a model of a heart valve using a film canister, a piece of masking tape, and a piece of paper. They investigate their "valve" by altering it to see what happens...

    1 cent - $1 per group Ages 4 - adult 10 to 30 minutes