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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.

Are balloons porous or non-porous? In this activity, learners watch an entertaining Mr. O video and conduct a simple experiment to find out.

In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.

In this activity, learners use colored candy to represent subatomic particles and make a model of an atom (Bohr model).