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    University of Colorado Boulder
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    In this activity, learners get hands-on with geometry by making a polyhedron kitty sculpture. Several of the kitty's body parts are variations of a polyhedron called the rhombicuboctahedron -...

    1 cent - $1 per student Ages 8 - adult 10 to 30 minutes
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    National Optical Astronomy Observatory
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    This is a classic exercise for visualizing the scale of the Solar System. Both the relative size and spacing of the planets are demonstrated in this outdoor exercise, using a mere peppercorn to...

    1 cent - $1 per group Ages 6 - adult 45 to 60 minutes
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    Science Museum of Minnesota
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    Learners will construct a model of a heart valve using a film canister, a piece of masking tape, and a piece of paper. They investigate their "valve" by altering it to see what happens...

    1 cent - $1 per group Ages 4 - adult 10 to 30 minutes
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    Astronomical Society of the Pacific
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    This fun and simple hands-on astronomy activity lets learners build a scale model of the universe with little more than adding machine tape. Learners are often surprised to find how empty the outer...

    1 cent - $1 per student Ages 6 - adult 45 to 60 minutes

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