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    Oregon Museum of Science and Industry
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    In this chemistry activity, learners fill two test tubes with a solution of "artificial stomach fluid," consisting of hydrochloric acid in the same concentration as in human stomachs,...

    $1 - $5 per group Ages 14 - adult 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    Learners add acid rain (nitric acid) to two cups that represent lakes. One cup contains limestone gravel and the other contains granite gravel. Learners also add an indicator to each solution that...

    1 cent - $1 per group Ages 14 - adult 5 to 10 minutes