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    University of Wisconsin-Madison
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    In this investigation, learners plant seeds in a 2-liter bottle filled with soil that is connected to a water source below. Over the next few weeks, learners observe how the plants grow. The...

    $1 - $5 per student Ages 4 - 14 1 to 4 weeks
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    University of Wisconsin-Madison
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    Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle. The fermentation process takes from 3 days to 2 weeks to complete, and learners measure the...

    $1 - $5 per group Ages 4 - 14 1 to 4 weeks
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    Museum of Science and Industry, Chicago
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    Learners assemble a figure from a nylon stocking or sock stuffed with soil and seeds. The ends of the nylons inside the jar absorb water, which feeds the grass seeds. The seeds grow to become...

    $1 - $5 per student Ages 4 - 11 1 to 4 weeks
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    Science Museum of Minnesota
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    Build a fruit fly trap out of a 2-liter plastic bottle and some rotten fruit! Fruit flies are easy to catch in warm weather. Once you catch some, you will be able to see their life cycle up-close....

    1 cent - $1 per student Ages 4 - 11 1 to 4 weeks
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    The Exploratorium
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    In this hands-on botany activity, learners sprout vegetables in film canisters. Learners grow nine seeds each of cabbage, radish, and parsley, experimenting with changing one variable (light, water...

    1 cent - $1 per student Ages 4 - 11 1 to 4 weeks
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    PBS
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    In this "Sid the Science Kid" activity, learners observe how plants change as they grow. Learners examine the effects of growth by measuring and recording changes in plants over days and...

    $5 - $10 per group Ages 4 - 6 1 to 4 weeks
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    Omaha's Henry Doorly Zoo
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    In this activity, learners gain a better understanding of how household/school waste breaks down in a landfill. Learners collect trash and then create miniature landfills in 2-liter bottles....

    1 cent - $1 per student Ages 4 - 14 1 to 4 weeks
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    Bill Nye
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    In this activity, learners build an instrument for catching and observing flies. Learners act as entomologists, attract flies into a jar using a slice of apple, and then observe the flies'...

    $1 - $5 per group Ages 4 - 18 1 to 4 weeks
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    Sacramento Zoo
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    In this activity, learners observe how a little worm turns into a full-grown beetle. Learners will be surprised to learn that mealworms aren't worms at all--they're the larval stage of a...

    $5 - $10 per group Ages 4 - 11 1 to 4 weeks