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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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    New York Hall of Science
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    This lesson challenges groups of learners to design and construct a wind generator with the most electrical output. The lesson focuses on the engineering design process and how it is used to...

    $10 - $20 per group Ages 11 - 14 2 to 4 hours
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    National Health Museum
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    This lesson is designed to serve as an introduction to the immune system. It can stand alone or it can lead into further studies of the immune system. The primary focus of this inquiry-based lesson...

    Over $20 per group Ages 14 - adult 2 to 4 hours