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    The Exploratorium
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    In this activity, learners separate the components of Gatorade using a home-made affinity column. In doing so, learners model the basic principle of affinity chromatography, a technique used to...

    $10 - $20 per student Ages 11 - 18 45 to 60 minutes
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    Centers for Ocean Sciences Education Excellence
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    This activity provides a hands-on experience with a scale model, a relatively high viscosity fluid, and feeding behaviors. Learners attempt to capture "food" (a lentil) with a feeding...

    $5 - $10 per group Ages 8 - 18 30 to 45 minutes
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    Astronomical Society of the Pacific
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    In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets. Learners will investigate the ingredients in comets and how...

    $5 - $10 per group Ages 6 - adult 10 to 30 minutes