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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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    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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    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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    Lunar and Planetary Institute
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    In this activity, learners simulate what happens to a human spine in space by making Sponge Spool Spines (alternating sponge pieces and spools threaded on a pipe cleaner). This represents a human...

    $5 - $10 per group Ages 8 - 14 10 to 30 minutes
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    New Jersey Department of Education
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    In this investigation, learners explore the force known as buoyancy by placing various objects into water and observing how they behave (for example, which sink more quickly, which float, how much...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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    Institute of Physics
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    In this physics demonstration, learners will be surprised when a handkerchief holds water in an upside-down glass. They will be especially shocked when you hold the glass over their head and...

    free Ages 4 - adult Under 5 minutes
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    Astronomical Society of the Pacific
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    This fun and simple hands-on astronomy activity lets learners experiment with a bucket, stretchy fabric, marbles, and weights to discover some basics about gravity. Learners will explore how mass...

    $10 - $20 per group Ages 6 - adult 10 to 30 minutes
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    WGBH
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    In this design challenge activity, learners build a tower that can support a tennis ball at least 18 inches off the ground while withstanding the wind from a fan. Learners will build a sturdy frame...

    1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners build a simple mechanism that regulates the "escape" of energy released by a falling weight by portioning it into discrete amounts. Escapements are found in...

    $1 - $5 per student Ages 11 - 18 45 to 60 minutes

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