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    Pratt School of Engineering, Duke University
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    Each learner chews a piece of gum until it loses its flavor, and then leaves the gum to dry for several days. By weighing the gum before and after chewing, they can determine the amount of mass...

    $1 - $5 per group Ages 11 - 14 2 to 4 hours
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    Pratt School of Engineering, Duke University
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    Learners apply their knowledge of heat transfer to design two cans - one that will retain heat and one that will cool down quickly. After constructing their cans, learners fill the cans with warm...

    $1 - $5 per group Ages 11 - 14 45 to 60 minutes