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Learners make a refrigerator that works without electricity. The pot-in-pot refrigerator works by evaporation: a layer of sand is placed between two terra cotta pots and thoroughly soaked with water.

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

Learners create a small explosion by collecting hydrogen and oxygen gas together and squeezing them into a flame.

Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.