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    The Exploratorium
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    Construct a simple battery that's able to power a small light or motor out of foil, salt water, and charcoal. A helpful video, produced by the Exploratorium, guides you along on this activity.

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    The Exploratorium
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    An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens. This activity provides instructions for recycling a potato chip can to make your own...

    $1 - $5 per student Ages 6 - 18 10 to 30 minutes
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    Lawrence Hall of Science
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    In this activity, learners make their own pinhole viewer in order to measure the size of the sun. After using the viewer to project circular image of the Sun on paper, learners use ratios and an...

    $1 - $5 per group Ages 8 - adult 10 to 30 minutes
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    The Exploratorium
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    It's difficult to see convection currents in any liquid that's undergoing a temperature change, but in this Exploratorium Science Snack, you can see the currents with the help of food...

    1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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    NISE Network
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    In this demonstration, learners discover that nanoparticles behave differently, in part because they have a high surface area to volume ratio. Learners learn that smaller particles have a much...

    Over $20 per group Ages 6 - adult 10 to 30 minutes