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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