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    Computer Science Unplugged
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    In this puzzle, learners investigate the decisions involved in linking a network between houses in a muddy city. It can lead on to a discussion of minimal spanning tree algorithms for optimizing...

    1 cent - $1 per student Ages 8 - 18 30 to 45 minutes
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    The Exploratorium
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    In this hands-on and feet-on excursion, learners take a science walk to visualize the planet's immense size and numerous structures, without the usual scale and ratio dimensions found in most...

    1 cent - $1 per group Ages 11 - 18 45 to 60 minutes
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    Computer Science Unplugged
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    In this activity related to computer programming, learners give directions to a "robot" (either an adult or another learner) and find out which instructions the robot is able to follow,...

    $1 - $5 per group Ages 6 - 18 10 to 30 minutes
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    The Exploratorium
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    In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern. With...

    $5 - $10 per group Ages 11 - 18 1 to 2 hours
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    The Exploratorium
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    In this activity, learners simulate the process of DNA fingerprinting by using electricity to separate colored dyes. Learners use simple materials to assemble a comb (electrophoresis chamber) to...

    Over $20 per group Ages 11 - 18 1 to 2 hours
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    Astronomical Society of the Pacific
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    This fun and simple hands-on astronomy activity demonstrates the shadow of the Earth as it rises as a dark blue shadow above the eastern horizon. Shadows are not just what we see on the sidewalk,...

    $5 - $10 per group Ages 6 - adult 10 to 30 minutes
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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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    IEEE
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    In this activity, learners explore surgical instrument design. Teams of learners construct surgical instruments from everyday materials. They then test their surgical instruments to determine how...

    $5 - $10 per group Ages 8 - 18 1 to 2 hours
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    PhET
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    In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light. They can also...

    free Ages 6 - adult 5 to 10 minutes
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    American Museum of Natural History
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    In this activity, Christina Elson, an archaeologist from the American Museum of Natural History, guides learners as they investigate an "artifact" and record their observations in a field...

    free Ages 8 - 18 10 to 30 minutes

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