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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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    Astronomical Society of the Pacific
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    In this activity, learners use a simple 3D model to discover why the Moon has phases. This activity is a very rewarding "ah-ha!" moment for learners since it helps to correct one of the...

    $5 - $10 per group Ages 6 - adult 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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    American Society for Microbiology
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    Learners observe a model of a cell and its chromosomal DNA made from a plastic egg and dental floss. Use this model to illustrate how much DNA is held in one cell. For comparison, multiple eggs can...

    1 cent - $1 per group Ages 8 - 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 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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    Howard Hughes Medical Institute
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    In this activity, learners explore how genetic switches function and the role of genetic switches in the process of evolution. To make these concepts less abstract and more understandable, learners...

    Ages 14 - adult 1 to 2 hours
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    Astronomical Society of the Pacific
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    In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets. Learners will investigate the ingredients in comets and how...

    $5 - $10 per group Ages 6 - adult 10 to 30 minutes