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    Arizona Science Center
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    In this activity, learners explore how molecules must fit together, like a lock and key, in order to identify each other and initiate a new function as a combined unit. By fitting their hands into...

    $1 - $5 per group Ages 8 - 11 45 to 60 minutes
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    The Exploratorium
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    In this activity, learners model directed evolution by making paper fly. Learners construct and fly paper airplanes. During the first round, they calculate the average distance the planes fly and...

    $1 - $5 per group Ages 8 - 18 45 to 60 minutes
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    University of Washington
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    In this activity, learners make a Benham Top to explore visual illusions and optics. This activity guide includes three different instructions for making the spinner using various recycled...

    $1 - $5 per student Ages 8 - 18 30 to 45 minutes
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    WGBH
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    In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision. When you spin the Thaumatrope, the pictures move so quickly that your eyes and brain can&...

    $1 - $5 per student Ages 6 - 11 5 to 10 minutes
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    University of Washington
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    In this activity (7th activity on the page), learners use their sense of hearing to find a "sound match." Learners shake containers filled with items like dry seeds, sand, beans, etc. and...

    $1 - $5 per group Ages 4 - 14 5 to 10 minutes
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    Kohl Children's Museum
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    In this activity, learners follow a recipe to create play dough scented with fruit-flavored drink mix. As they mix together the ingredients, learners are encouraged to use descriptive words to...

    $1 - $5 per group Ages 4 - 8 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns. Learners will use Benham's...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    Lunar and Planetary Institute
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    In this activity, learners predict whether a ball on Earth or a ball on the Moon bounces higher when dropped and why. They simulate the experiment by dropping high- and regular-bounce balls from...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Community Science Workshop Network
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    In this activity, learners build a figure that moves and "comes to life" when they pull its string. This engineering activity introduces learners to simple machines, specifically levers,...

    $1 - $5 per student Ages 6 - 14 1 to 2 hours
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    Iridescent
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    In this engineering design challenge, learners animate a facial expression and make a machine (zoetrope) that plays the animation back. As learners work their way through the design process, they...

    $1 - $5 per group Ages 4 - 18 1 to 2 hours

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