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    Chicago Children's Museum
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    In this activity (located on page 7 of PDF), learners explore how Silly Putty was first invented and then attempt to make a batch of their own. Learners experiment by mixing liquid laundry starch...

    $10 - $20 per group Ages 4 - 11 45 to 60 minutes
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    Lunar and Planetary Institute
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    In this activity, learners consider how a simple machine, a lever, turns a small push or pull (a small force) into a larger--or stronger--push or pull (a larger force). Learners then apply this...

    Over $20 per group Ages 4 - 11 10 to 30 minutes
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    WGBH
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    In this engineering activity (page 5 of PDF), young learners investigate how materials and design contribute to the strength of a structure, particularly walls. Learners use different materials to...

    $1 - $5 per group Ages 4 - 8 45 to 60 minutes
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    American Association for the Advancement of Science
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    In this inquiry-based learning activity, learners design, build, and test their own ramps. They are introduced to a variety of materials and explore putting them together. They also create plans...

    $5 - $10 per group Ages 4 - 8 45 to 60 minutes
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    WGBH
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    This event guide features three related explorations in which learners investigate the following science concepts: how you design and build a structure helps determine how strong it will be;...

    $5 - $10 per group Ages 4 - 6 45 to 60 minutes
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    Chicago Children's Museum
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    In this activity, learners use cardboard bases and track tubes to make a ball run to explore the properties of mass, force, and motion. Learners test their ball runs using balls of various sizes,...

    $10 - $20 per group Ages 4 - 6 10 to 30 minutes
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    NASA
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    In this activity, learners construct a simple air pressure launcher for paper rockets. Learners stomp or jump on an empty 2-liter bottle and force the air inside through connected plastic pipes to...

    $10 - $20 per group Ages 4 - 14 1 to 2 hours