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    Pratt School of Engineering, Duke University
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    Each learner chews a piece of gum until it loses its flavor, and then leaves the gum to dry for several days. By weighing the gum before and after chewing, they can determine the amount of mass...

    $1 - $5 per group Ages 11 - 14 2 to 4 hours
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    Science Museum of Minnesota
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    This activity requires a Pico Cricket (tiny computer). Learners work on designing and building a sound sensor out of household materials, like plastic wrap and cardboard. This will connect with the...

    Over $20 per group Ages 8 - 18 2 to 4 hours
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    Biotechnology and Biological Sciences Research Council
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    In this activity (p.25 of PDF), learners investigate spores. Mushrooms produce millions of spores which are equivalent to the seeds of plants but without the massive food reserves. Spores are so...

    1 cent - $1 per student Ages 11 - 14 2 to 4 hours
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    University of Washington
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    In this activity, learners investigate the olfactory system by conducting several experiments. In "CLASS EXPERIMENT," learners find that the ability to detect an odor decreases with...

    $5 - $10 per group Ages 11 - 14 2 to 4 hours
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    Lawrence Hall of Science
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    This warm weather activity introduces learners to the impact trees have on blocking the sun's heat and reducing temperature on the Earth's surface. Learners set containers with water in a...

    1 cent - $1 per student Ages 4 - 14 2 to 4 hours
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    California Academy of Sciences
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    In this activity, learners visualize the differences in water density and relate this to the potential consequences of increased glacial melting. This activity can be conducted as a demonstration...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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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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    NASA
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    Through a series of simple body movements, learners gain insight into the relationship between time and astronomical motions of Earth (rotation about its axis, and orbit around the Sun), and also...

    $5 - $10 per group Ages 11 - adult 2 to 4 hours
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    American Chemical Society
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    In this activity, learners investigate why apples turn brown. Learners discover that lemon juice interferes with the reaction that causes the browning.

    $1 - $5 per group Ages 4 - 11 2 to 4 hours
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    The Exploratorium
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    In this activity, learners build bridges out of newspaper and tape to explore how structures are designed to bear loads. Learners adjust and modify their designs to accommodate a certain amount of...

    1 cent - $1 per group Ages 4 - 11 2 to 4 hours

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