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    WGBH
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    In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents. Learners will explore gravity and buoyancy in this simple and...

    $1 - $5 per student Ages 8 - 14 10 to 30 minutes
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    Community Science Workshop Network
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    In this activity, learners construct a traditional handicraft toy that illustrates a motion commonly associated with violins and earthquakes. This motion has a certain frequency and stays at the...

    $1 - $5 per student Ages 6 - 11 45 to 60 minutes
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    New York Hall of Science
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    In this activity, learners investigate how changing the center of gravity of a balloon affects how it travels. Learners fill a balloon with a little bit of water and insert into an empty balloon....

    1 cent - $1 per student Ages 8 - 14 Under 5 minutes
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    WGBH
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    In this activity, learners make a foam packing peanut "flink"--neither float away nor sink--in water. Learners experiment with materials to make a Flinker that "flinks" for 10...

    1 cent - $1 per student Ages 6 - 11 5 to 10 minutes
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    WGBH
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    In this activity, learners make a helium balloon "flink"--neither float away nor sink to the ground. Use this activity to introduce physics concepts related to gravity, density, and weight.

    $1 - $5 per student Ages 6 - 11 10 to 30 minutes
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    The Exploratorium
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    In this demonstration, learners watch as a device drops a ball into a cup without touching the ball or cup, even though the ball and cup are virtually side-by-side. Specifically, this device...

    $10 - $20 per group Ages 11 - 18 5 to 10 minutes
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    Lunar and Planetary Institute
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    In this activity, learners work in pairs to measure each other's ankles with lengths of string. Learners make measurements both before and after lying on their backs with their feet in the air...

    $1 - $5 per group Ages 8 - 14 5 to 10 minutes
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    NASA
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    In this activity, learners build water-propelled engines from soft drink cans. Water flowing out of holes in the can cause the can to rotate in the direction opposite to the stream, explained by...

    $1 - $5 per group Ages 4 - 14 30 to 45 minutes
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    Community Science Workshop Network
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    Learners explore magnetism and motion as they build a simple marble run. Learners test different arrangements of plastic and cardboard tubes, bottles, and cups on a magnetic board. Learners use...

    $5 - $10 per student Ages 6 - 14 1 to 2 hours
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    The Exploratorium
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    In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern. With...

    $5 - $10 per group Ages 11 - 18 1 to 2 hours

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