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Shrinky Dinks

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Heat makes some materials expand, and it makes others shrink.
1 cent - $1 per student Ages 4 - 11 30 to 45 minutes

Cartesian Diver

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In this quick activity (page 1 of the PDF under SciGirls Activity: California Fish), learners will build a simple Cartesian Diver in an empty 2-liter bottle.
1 cent - $1 per group Ages 8 - 14 10 to 30 minutes