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    Biotechnology and Biological Sciences Research Council
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    In this activity (p.8-9 of PDF), learners investigate the evolution of wheat by conducting sedimentation tests on different flours. The evolution of wheat from wild grasses demonstrates the...

    $5 - $10 per group Ages 8 - adult 10 to 30 minutes
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    Colorado State University
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    In this demonstration, learners can observe a number of small convection cells generated from a mixture of aluminum powder and silicon oil on a hot plate. This demonstration helps learners...

    $5 - $10 per student Ages 8 - 14 5 to 10 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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    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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    NISE Network
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    In this nanoscience activity, learners discover that it's easy to pour water out of a regular-sized cup, but not out of a miniature cup. They learn that size can affect the way materials like...

    $5 - $10 per group Ages 4 - adult 5 to 10 minutes
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners create beautiful fluid motion. They explore fluid dynamics, surface tension, solubility, and buoyancy while mixing liquids together. Learners can photograph or film the fluid motion for...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    The Exploratorium
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    In this optics activity, demonstrate diffraction using a candle or a small bright flashlight bulb and a slide made with two pencils. Learners will observe the diffraction pattern and learn that...

    $5 - $10 per student Ages 8 - 18 10 to 30 minutes
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    University of Illinois Urbana-Champaign
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    In this activity, learners use pop-beads to understand the characteristics and properties of polymer chains. Learners discover how cross-linked polymers behave differently than non-cross-linked...

    $5 - $10 per student Ages 14 - adult 10 to 30 minutes
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    Biotechnology and Biological Sciences Research Council
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    In this activity (p.5-6 of PDF), learners investigate natural selection. Learners discover that natural selection, which takes place over decades, can lead to altered populations within a species....

    $5 - $10 per group Ages 8 - 11 10 to 30 minutes
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    The Exploratorium
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    In this activity, learners use their strength to light a light bulb. A chain made from paper clips is placed in series with a battery and flashlight bulb. When the chain is stretched, the light...

    $5 - $10 per group Ages 11 - 18 10 to 30 minutes

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