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    American Chemical Society
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    In this activity, learners cut out a fish and then "paint" it using universal indicator and acids and bases. The initial coat of indicator changes the color of the paper (it will turn a...

    $1 - $5 per student Ages 4 - 14 10 to 30 minutes
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    The Exploratorium
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    Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

    1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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    Twin Cities Public Television
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    In this activity (on page 2 of the PDF), learners will see the illusion of colors produced by a rotating black and white image known as Benham’s Disk. They will experiment with rotation direction...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes