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    The Exploratorium
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    Discover how a refracting telescope works by making one from scratch using common items. This telescope won't have a tube so the learner can see how an image is formed inside the telescope....

    $10 - $20 per group Ages 14 - adult 45 to 60 minutes
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    Astronomical Society of the Pacific
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    This fun and simple hands-on astronomy activity lets learners explore the difference between telescope magnification and resolution. They will learn that observing instruments, whether telescopes...

    $1 - $5 per group Ages 4 - adult 10 to 30 minutes
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    Chicago Children's Museum
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    In this activity, learners draw natural objects to explore the details, differences, and similarities of natural objects. Learners investigate plants, seeds, pinecones, and other items from nature...

    $5 - $10 per group Ages 6 - 11 10 to 30 minutes
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    Optical Society of America
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    In this optics activity, learners discover basic lens-making techniques by using a tennis ball to make a lens out of ice. After the ice freezes, learners will use the lens to magnify images in a...

    $1 - $5 per student Ages 14 - adult 2 to 4 hours
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    BioEd
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    In this activity related to microbes, learners make slides of cells from an onion skin and Elodea (American or Canadian waterweed) to observe under a microscope. With these examples, learners will...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    Optical Society of America
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    In this activity, learners complete a series of drawing activities to explore scale and powers of 10. Learners first trace each other on 1-meter-square pieces of paper. Next, they trace a found...

    1 cent - $1 per student Ages 14 - 18 30 to 45 minutes
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    The Exploratorium
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    This activity provides instructions for building a mirrored tube--a smaller and simpler version of a submarine's periscope--that lets you see around corners and over walls. Get a hands-on...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    Optical Society of America
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    In this optics activity, learners make a simple telescope using two lenses and a cardboard tube. Learners construct the telescope and then calculate its magnification. Use this activity to...

    $1 - $5 per student Ages 8 - 14 5 to 10 minutes
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    American Society for Microbiology
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    Learners use a Microviewer to examine common objects at 60-100X magnification. After viewing these things, learners categorize them according to their properties. They create a game board to...

    Over $20 per group Ages 8 - 18 45 to 60 minutes
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    American Chemical Society
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    In this activity, learners discover that they can create a lens from a water drop. Learners test their lens by looking at words or pictures.

    1 cent - $1 per group Ages 4 - 11 10 to 30 minutes

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