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    New York Hall of Science
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    In this activity, learners complete simple exercises to investigate the relationship between force, area and pressure and their effects on materials. Use this activity to introduce learners to how...

    1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners investigate stress and strain by designing, building, and testing beams made from polymer clay. They compete to find the best beam strength to beam weight ratio, and learn about the trade...

    $1 - $5 per student Ages 11 - 18 30 to 45 minutes
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    The Exploratorium
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    In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic. Learners place a fork between two pieces of polarizing material and induce stress by...

    $5 - $10 per group Ages 8 - 18 5 to 10 minutes
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    The Exploratorium
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    In this math activity, learners observe and sketch cracking patterns in pavement. Learners use a protractor to measure and label the angles of their sketches and conclude if some angles are more...

    1 cent - $1 per student Ages 11 - 18 10 to 30 minutes
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    NSBRI
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    In this activity about physical stress (page 28 of PDF), learners discover that muscles and bones need to work to stay strong. In part 1, learners investigate how physical stress can affect bone (a...

    $1 - $5 per group Ages 6 - 11 1 to 4 weeks