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Aluminum-Air Battery: Foiled again!
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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.

Crystal Creations: Grow Spikes of Crystals in the Sun
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This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.