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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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    Oregon Museum of Science and Industry
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    Learners compare the properties and solubilities of Styrofoam (TM), ecofoam packing peanuts, and popcorn. First, the solubility of each substance is tested in water. A drop of iodine is added to...

    1 cent - $1 per group Ages 11 - adult Under 5 minutes
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    Oregon Museum of Science and Industry
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    Learners use a candle to investigate the products of combustion. When a glass rod is held over a lit candle, the candle flame deposits carbon on the rod. Then the candle and a drop of pH indicator...

    1 cent - $1 per group Ages 11 - adult 5 to 10 minutes
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    Science Museum of Minnesota
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    The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water. A real cenote is...

    1 cent - $1 per student Ages 6 - adult 10 to 30 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
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    Oregon Museum of Science and Industry
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    Learners combine different plant solutions -- made from fruits, vegetables, and flowers -- with equal amounts of vinegar (acid), water (neutral), and ammonia (base). They compare the color changes...

    1 cent - $1 per group Ages 11 - adult Under 5 minutes