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    Oregon Museum of Science and Industry
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    This is an online activity where learners can virtually mix different colors of light or paint (you can switch between them) and see how the colors combine. It demonstrates how millions of colors...

    free Ages 6 - adult 5 to 10 minutes
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    WGBH
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    This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to...

    1 cent - $1 per group Ages 6 - adult 5 to 10 minutes
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    The Exploratorium
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    Experience a spinning spiral...you won't be hypnotized, but you'll see what happens when you look away. It's like getting off a merry-go-round and everything keeps moving.

    1 cent - $1 per student Ages 6 - adult Under 5 minutes
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    Science Museum of Minnesota
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    This online activity lets learners explore how computer programs called "CAPTCHAS" work to test whether you are a human or a computer. Learners will be tested with a series of visual...

    free Ages 6 - adult 5 to 10 minutes
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    Science Museum of Minnesota
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    This online activity lets learners discover to what extent they notice changes to an online image. The activity has two parts. In part one, learners look at a scene and try to notice what happens...

    free Ages 6 - adult 5 to 10 minutes