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

This activity was designed for blind learners, but all types of learners can model how vibrating particles, such as in a sound wave, bump into other particles causing them to vibrate, and that the vib

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.