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    The Exploratorium
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    In this activity, learners can create five-layer density columns by employing one of three (or all) methods. Method 1 gives the names of the liquids and the order for adding them, and its goal is...

    $5 - $10 per group Ages 11 - 18 45 to 60 minutes
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    Pratt School of Engineering, Duke University
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    Learners initially test to see how many drops of liquid (water, rubbing alcohol, and vegetable oil) can fit on a penny. They then generate their own hypotheses to explain the results and design...

    $1 - $5 per group Ages 11 - 14 10 to 30 minutes
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    NISE Network
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    In this activity, learners explore how nanosized structures can create brilliant color. Learners examine Blue Morpho butterflies in the light and discover what happens when they put a drop of...

    Over $20 per group Ages 6 - adult 10 to 30 minutes
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    NISE Network
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    In this activity, learners explore deoxyribonucleic acid (DNA), a nanoscale structure that occurs in nature. Learners extract a sample of DNA from split peas and put the sample in an Eppendorf tube...

    Over $20 per group Ages 6 - adult 10 to 30 minutes
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    Make
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    In this activity, learners make a small batch of biodiesel that will work in any diesel engine. Learners use an old juice bottle as a "reactor" vessel to chemically process vegetable oil...

    $10 - $20 per group Ages 14 - adult 1 to 7 days