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This activity was designed for blind learners, but all types of learners can explore the three states of matter by examining tactile models that illustrate the characteristics of particles in each sta

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

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.