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    In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain. With this understanding, they try to find a combination of chemicals that could be used to...

    $10 - $20 per group Ages 4 - 14 10 to 30 minutes
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    Twin Cities Public Television
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    In this quick activity about the properties of water (page 1 of PDF), learners will use an eyedropper to slowly place one drop of water at a time onto a penny, counting the number of drops until...

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes

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