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    Twin Cities Public Television
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    This is an activity (located on page 3 of the PDF) about diffusion of small molecules across cell membranes. Learners will use gelatin to represent a cell and dye to represent molecules to model...

    $10 - $20 per group Ages 8 - 14 1 to 7 days
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    National Health Museum
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    In this activity, learners use bubbles to investigate the structure and unique properties of cell membranes. Bubbles serve as macroscopic models that mimic the cells' phospholipid bilayers....

    $5 - $10 per group Ages 11 - 18 45 to 60 minutes
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    The California Study, Inc.
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    In this activity, learners explore how various energy sources can be used to cause a turbine to rotate. Learners will construct a turbine that is not strong enough to operate an electrical...

    $1 - $5 per group Ages 8 - 14 1 to 2 hours