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    Oregon Museum of Science and Industry
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    Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water. Oxygen gas is formed in the tube connected to the...

    $10 - $20 per group Ages 11 - adult Under 5 minutes
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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. <b>[Activity is publicly available through a web...

    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