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    Lawrence Hall of Science
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    In this activity, learners build a bird feeder or feeders to attract birds for observation. The main feeder to be built is made from a large milk carton, but a suggestion is also included for a...

    $1 - $5 per group Ages 6 - 14 30 to 45 minutes
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    The Center for Science Education @ Space Sciences Laboratory, UC Berkeley
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    In this activity, learners investigate the concepts of relative size and distance by creating a basic model of the solar system. Learners will work at one end of a hallway, large room or outdoor...

    1 cent - $1 per group Ages 6 - 14 30 to 45 minutes
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    Lunar and Planetary Institute
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    In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods. Learners dunk the "planets" in water to...

    $10 - $20 per group Ages 8 - 14 30 to 45 minutes
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    Science Museum of Minnesota
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    Create airplanes from straws and geometric shapes. Test them out to see how far they can fly, or how accurately they can be aimed. All you need is a straw, two strips of paper, and some tape to...

    1 cent - $1 per student Ages 4 - 14 30 to 45 minutes
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    American Association for the Advancement of Science
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    In this version of tag, a large group of learners model how the body fights infection. Learners act as germs, as lymphocytes, and as the body's cells threatened by germs. After playing one...

    $1 - $5 per group Ages 8 - 11 30 to 45 minutes
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    Astronomical Society of the Pacific
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    This fun and simple hands-on astronomy activity lets learners explore model planets (that they or an educator will create), using methods NASA scientists use to explore our Solar System. Learners...

    Ages 8 - adult 30 to 45 minutes
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    4-H
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    In this activity, learners design and build a simple wind vane —one of the oldest kinds of weather tools— and use it to show wind direction. The activity can be done outdoors on a windy day or...

    $5 - $10 per group Ages 8 - 14 30 to 45 minutes
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    WGBH
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    In this engineering activity (page 3 of PDF), young learners investigate how a pole can be made stable by “planting” its base in the ground or adding supports to the base. First, learners observe...

    $1 - $5 per group Ages 4 - 8 30 to 45 minutes