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In this activity (on page 2 of PDF), learners make their own totem poles out of recycled materials.

This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

This quiz lets you estimate your annual radiation exposure.

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.

Learners create an Incan counting device called a quipu (pronounced kee-poo).

Learners make their own simple slide rules out of paper and learn how they work.