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    The Exploratorium
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    In this activity, learners use their hands as tools for indirect measurement. Learners explore how to use ratios to calculate the approximate height of something that can't be measured...

    free Ages 11 - 14 10 to 30 minutes
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    NASA
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    In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system. Learners can see the parallax effect in action by holding their thumb...

    free Ages 6 - 18 Under 5 minutes