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    The Exploratorium
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    In this activity, learners light an LED with five cents. Learners use two different metals and some sour, salty water to create a cheap battery. Learners also have the option of checking the...

    1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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    Twin Cities Public Television
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    This is an activity (located on page 3 of the PDF under Stained Glass Activity) about nanotechnology making its way into everyday products, such as sunscreen, and how effective these invisible...

    $10 - $20 per group Ages 8 - 14 2 to 4 hours