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In this activity, learners build a simple qualitative conductivity tester with a battery, bulb and foil.

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.

In this activity, learners build a simple electrolysis device. Then learners use an indicating solution to visualize hydrogen and oxygen molecules in water.

Water treatment on a large scale enables the supply of clean drinking water to communities.