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In this design challenge, leaners attempt to build a strong structure out of LEGO® bricks that can withstand a 4-foot drop.

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.

In this activity (on page 2 of the PDF), learners (with adult help and supervision) investigate how heat affects polystyrene plastic.

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

In this activity (on page 2), one person "programs" the other like a robot to move through a space, trying to get them to avoid obstacles and reach a goal.

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.