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In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.

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).

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.

Build and test a scale model of a rainforest canopy walkway.