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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.

Over $20 per group Ages 6 - adult 10 to 30 minutes
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This is a quick activity (on page 2 of the PDF under Stained Glass Activity) about the "Tyndall effect," the scattering of visible light when it hits very small dispersed particles.

$5 - $10 per group Ages 8 - 14 10 to 30 minutes