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    Twin Cities Public Television
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    This is an activity (on page 2 of the PDF) about the two main components of bone - collagen and minerals (like calcium) - and how they each contribute to its flexibility and strength. Learners will...

    $5 - $10 per group Ages 8 - 14 1 to 7 days
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    COSI
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    In this environmental science activity (page 4 of the PDF), learners use vinegar and chalk to observe the effect of acid rain on various building materials and plant life. Learners will explore how...

    $1 - $5 per group Ages 6 - 14 4 to 24 hours
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    Railroad Commission of Texas
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    In this activity about global climate change, learners will conduct an experiment and collect data to compare the amount of carbon dioxide (CO2) in four different sources of gases. Learners will...

    $5 - $10 per student Ages 11 - 18 45 to 60 minutes
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    GreenLearning Canada
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    Learners follow directions to construct a water-powered electrical generator using a turbine made from plastic spoons. The model generates a surprising amount of electricity, enough to light a...

    $10 - $20 per student Ages 11 - 18 1 to 2 hours