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

This quiz lets you estimate your annual radiation exposure.

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 build models of sinkholes to gain an intuitive knowledge of their physical aspects.

In this activity, a group of learners work collaboratively to design and construct a paper model showing the evolution of an environment through multiple stages, from prehistory through the modern cit

In this experiment, learners design and build a model room in a shoebox and furnish it with tiny furniture.

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.