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    NOAA
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    In this activity, learners model estuaries, artificially enriching both fresh and salt water samples with different amounts of nutrients and observing the growth of algae over several weeks....

    $5 - $10 per group Ages 14 - 18 1 to 4 weeks
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    Biotechnology and Biological Sciences Research Council
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    In this activity (page 5), learners investigate the evolution of wheat by washing different types of dough with water and comparing the results. The evolution of wheat from wild grasses...

    $10 - $20 per group Ages 8 - adult 1 to 2 hours
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    Twin Cities Public Television
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    In this technology activity, learners light up the room with electrifying play dough creations. Learners use conductive and insulating homemade play dough to build simple circuits. Learners then...

    Over $20 per group Ages 8 - 14 1 to 2 hours
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    NOAA
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    In this activity, learners make a model of a pollution spill that occurred at Bangs Lake in Mississippi and measure water quality parameters in their model. Learners then study the actual spill,...

    Over $20 per group Ages 14 - 18 2 to 4 hours