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    Astronomical Society of the Pacific
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    This fun hands-on astronomy activity uses a variety of simple props to help learners understand why they see what they see in a telescope. They will learn about how the eye works, how to use the...

    $1 - $5 per group Ages 4 - adult 5 to 10 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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    University of Nebraska State Museum
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    This activity (on pages 7-13) has pairs of learners survey an array of similarities and differences between them. The differences survey worksheet focuses on genetically inherited physical features...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    The Exploratorium
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    In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired. Learners will stare at a simple red shape, such as a bird,...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    The Exploratorium
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    In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water. Learners explore why the lens inverts images and also reverses the motion of...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    The Exploratorium
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    In this optics/mathematics activity, learners use two hinged mirrors to create a kaleidoscope that shows multiple images of an object. Learners discover that the number of images reflected in the...

    $5 - $10 per student Ages 6 - 14 10 to 30 minutes
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    The Exploratorium
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    In this activity about depth perception, learners create an optical illusion in a shoe box. By looking through the viewing hole, learners explore how they can trick their brain into thinking that...

    $1 - $5 per student Ages 6 - 18 10 to 30 minutes
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    The Exploratorium
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    Up close, an array of dots could look random, but take a step back, and an image forms. By tracing over an image, learners can create their own dot based image. Learners can be very creative with...

    1 cent - $1 per student Ages 6 - 14 5 to 10 minutes
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    The Exploratorium
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    Closing one eye eliminates one of the clues that your brain uses to judge depth. Trying to perform a simple task with one eye closed demonstrates how much you rely on your depth perception. In this...

    1 cent - $1 per student Ages 6 - 14
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    The Exploratorium
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    Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them. Close one eye after making a Far-Out Corner and the "...

    1 cent - $1 per student Ages 6 - 18 5 to 10 minutes

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