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    NASA
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    In this activity learners observe mold growth on different types of bread by measuring and recording the growth rate. Educators can use this activity to introduce a challenge astronauts face while...

    $5 - $10 per group Ages 8 - 14 1 to 4 weeks
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    The Exploratorium
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    This activity shows you how to make a mold terrarium using a jar and leftover food. Learners explore mold, an "icky but necessary" thing that helps living matter rot, return to the soil,...

    1 cent - $1 per group Ages 8 - 14 1 to 4 weeks
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    NASA
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    In this activity, learners test the rate of ripening fruit and vegetables and use a chemical to inhibit the ripening process. After the experiment, learners measure the exposed surface area of the...

    $10 - $20 per group Ages 8 - 14 1 to 2 hours