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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners build particulate matter collectors--devices that collect samples of visible particulates present in polluted air. They place the collectors in various test sites and observe them over a...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    National Optical Astronomy Observatory
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    This is a classic exercise for visualizing the scale of the Solar System. Both the relative size and spacing of the planets are demonstrated in this outdoor exercise, using a mere peppercorn to...

    1 cent - $1 per group Ages 6 - adult 45 to 60 minutes
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    The Exploratorium
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    In this physics activity, learners conduct two experiments to explore free-falling. In the first experiment, water-filled plastic bottles with holes in them spurt water under normal conditions, but...

    $5 - $10 per group Ages 11 - 18 45 to 60 minutes