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    National Health Museum
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    In this activity, learners calculate the number of milliliters of water a nearby tree transpires per day. First, teams of learners go outdoors to collect five leaves from a mulberry or cottonwood...

    $1 - $5 per group Ages 14 - 18 4 to 24 hours
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    American Chemical Society
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    In this activity on page 4 of the PDF, learners conduct some quick and easy tests to determine the differences between water and other liquids that look very similar to water. Learners compare how...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes