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This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

In this activity about light and perception, learners create pictures in thin air.

Scientists use enormous wind tunnels to test the design of planes, helicopters, even the Space Shuttle.

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

In this activity, learners consider how a simple machine, a lever, turns a small push or pull (a small force) into a larger--or stronger--push or pull (a larger force).