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    Pratt School of Engineering, Duke University
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    Learners design their own experiment to explore the permeability of different materials such as soil, sand, gravel, and marbles. They will also be introduced to the basic concepts of building...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    Pratt School of Engineering, Duke University
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    Learners design their own experiment to determine conditions that either help or hinder the decomposition of carrots by soil microbes. They place carrots in plastic bags filled with soil (with or...

    $10 - $20 per group Ages 11 - 14 1 to 4 weeks
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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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    Pratt School of Engineering, Duke University
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    Historically, sea floor mapping (bathymetry) was done by soundings. Soundings are taken by dropping a weight with a pre-measured rope off the side of the boat and noting the measurement on the rope...

    $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 use a spring scale to drag an object such as a ceramic coffee cup along a table top or the floor. The spring scale allows them to measure the frictional force that exists between the...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes

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