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    PBS
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    In this math lesson, learners identify the relationship between the number of sides in a regular polygon and the number of struts needed to make each polygon rigid. Learners build polygons using...

    $1 - $5 per group Ages 8 - 11 45 to 60 minutes
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    The California Study, Inc.
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    In this activity, learners explore how various energy sources can be used to cause a turbine to rotate. Learners will construct a turbine that is not strong enough to operate an electrical...

    $1 - $5 per group Ages 8 - 14 1 to 2 hours
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    Chicago Children's Museum
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    This activity (located on page 2 of PDF) introduces learners to the real size of animals using nonstandard measurement. Learners use Unifix cubes and yarn lengths to measure a variety of animals ...

    $1 - $5 per group Ages 4 - 11 10 to 30 minutes
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    WNET.ORG
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    From the Weather Watchers featured theme on the CYBERCHASE website. Learners will conduct experiments to discover how air temperature and humidity work together to make condensation, dew, and fog....

    $1 - $5 per group Ages 8 - 11 45 to 60 minutes
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    Lawrence Hall of Science
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    In this activity, learners collect, arrange, and draw various seeds from smallest to biggest. They also estimate how many of the smallest would fit into the biggest. In addition, learners predict...

    $1 - $5 per student Ages 6 - 11 30 to 45 minutes
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    NASA
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    In this activity about the solar system, learners use various light sources to examine ice with different components to understand how NASA studies planets and moons from space. This detailed...

    $1 - $5 per group Ages 4 - 11 1 to 2 hours