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    Lawrence Hall of Science
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    In this activity, learners make their own pinhole viewer in order to measure the size of the sun. After using the viewer to project circular image of the Sun on paper, learners use ratios and an...

    $1 - $5 per group Ages 8 - adult 10 to 30 minutes
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    NISE Network
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    In this demonstration, learners discover that nanoparticles behave differently, in part because they have a high surface area to volume ratio. Learners learn that smaller particles have a much...

    Over $20 per group Ages 6 - adult 10 to 30 minutes