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    NASA
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    In this activity, learners discover that one way to cool an object in the presence of a heat source is to increase the distance from it or change the angle at which it is faced. Learners perform an...

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    Howard Hughes Medical Institute
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    This guided inquiry three-part activity engages learners in thinking about the mechanism of natural selection through data collection and pattern recognition. In this scenario, learners use M&...

    $5 - $10 per group Ages 11 - 18 1 to 2 hours
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    Twin Cities Public Television
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    In this activity, learners will test cups full of potting soil, sand, and sphagnum moss to see which earth material is able to soak up the most water. Using a scale and a simple calculation,...

    $5 - $10 per group Ages 8 - 14 1 to 2 hours
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    NOAA
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    In this activity, learners observe how salinity affects the freezing point of water by making and enjoying ice cream. Pairs of learners will combine ingredients in a plastic bag and then add...

    $5 - $10 per group Ages 6 - 14 30 to 45 minutes
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    Windows to the Universe
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    In this activity, learners investigate various appliances and electronics, discovering how much energy each uses and how much carbon dioxide (CO2) is released to produce that energy. Learners use a...

    Over $20 per group Ages 11 - 18 1 to 2 hours
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    Twin Cities Public Television
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    This activity (page 2 of the PDF) is a full inquiry investigation into decomposition. Groups of learners will carefully observe and record the appearance of items, such as an apple, that can...

    $10 - $20 per group Ages 8 - 14 1 to 4 weeks
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    Lawrence Hall of Science
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    In this outdoor, nighttime activity, learners gather around a brightly lit, white surface and study the behavior of nocturnal animals attracted to the light, particularly night fliers. Learners...

    $1 - $5 per group Ages 4 - 14 45 to 60 minutes
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    WGBH
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    Professor John Endler traveled to Trinidad in the 1970s to study wild guppies. In this activity, learners take part in an online simulation of Endler's work. Learners collect data, formulate a...

    1 cent - $1 per group Ages 11 - adult 45 to 60 minutes
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    Twin Cities Public Television
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    In this activity, learners build penetrometers to test leaf toughness. Biologists measure leaf toughness to study the feeding preferences of insects and bugs.

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    COSI
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    In this weather activity (page 10 of the PDF), learners will demonstrate the changes in atmospheric pressure by constructing their own barometer. Learners will explore the concept of barometric...

    $1 - $5 per student Ages 11 - 18 1 to 7 days

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