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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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    WGBH
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    In this design challenge activity, learners make a balloon hover at eye level for five seconds, and then make it move by creating air currents. The activity guide contains information for Educators...

    $1 - $5 per student Ages 8 - 14 45 to 60 minutes
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    Astronomical Society of the Pacific
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    This simple and engaging astronomy activity explains nuclear fusion and how radiation is generated by stars, using marshmallows as a model. Learners will explore what cosmic radiation is and where...

    $1 - $5 per group Ages 8 - adult 5 to 10 minutes
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    WGBH
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    In this design challenge activity, learners use two helium-filled balloons to build a blimp that can travel in a straight path across the room. The activity guide contains information for Educators...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    Children's Museum Of Houston
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    In this activity, learners create a model of a hot air balloon using tissue paper and a hairdryer. Educators can use this activity to introduce learners to density and its role in why things float....

    $5 - $10 per group Ages 6 - 14 1 to 2 hours
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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