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    American Physical Society
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    Learners experiment with water gel crystals, or sodium polyacrylate crystals, which absorb hundreds of times their weight in water. When in pure water, the water gel crystals cannot be seen....

    $5 - $10 per group Ages 11 - 18 45 to 60 minutes
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    Optical Society of America
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    In this activity, learners use Jell-O to explore lenses. Learners cut Jell-O into convex and concave lens shapes and examine how light exits each lens in a darkened room. They compare the rounded...

    $1 - $5 per student Ages 14 - 18 30 to 45 minutes
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    Optical Society of America
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    In this optics activity, learners explore how they can make gelatin stop light, but not stop them from seeing fruit suspended within. Learners will discover that gelatin contains large protein...

    1 cent - $1 per student Ages 8 - 14 5 to 10 minutes