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    Science Museum of Minnesota
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    This is a demonstration you can use to show learners how valves and pumps work in concert to move blood through the circulatory system.

    1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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    The Exploratorium
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    Ocean acidification is a problem that humans will have to deal with as we release more and more carbon dioxide into the atmosphere. This activity demonstrates how water can become acidic with the...

    $1 - $5 per student Ages 8 - 18 5 to 10 minutes
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    Science Museum of Minnesota
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    In this activity, learners will investigate the sounds of the heart. Learners construct two stethoscopes, one out of paper and another made from vinyl tubing and a plastic bottle, and investigate...

    $1 - $5 per group Ages 6 - 14 30 to 45 minutes
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    Science Museum of Minnesota
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    Learners will build a homemade pump using a balloon, a mason jar, and some straws. Then, using the weblinks provided, they will explore the workings of the heart by comparing the actions of their...

    1 cent - $1 per group Ages 6 - 14 45 to 60 minutes