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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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    Lunar and Planetary Institute
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    In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water...

    Over $20 per group Ages 4 - 14 10 to 30 minutes
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    Lunar and Planetary Institute
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    In this activity, learners are invited to imagine the park of their dreams! In small groups, learners place moveable pieces on a grid, iterating on their plan together to create a plan for a...

    $1 - $5 per group Ages 4 - 11 45 to 60 minutes
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    WGBH
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    In this interactive board game, learners "hire" different types of scientists to help canine character Ruff Ruffman solve unusual problems. Through Ruff's adventures, learners meet...

    1 cent - $1 per student Ages 6 - 11 45 to 60 minutes