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Learners take on the role of environmental engineers as they design water filters.

In this activity, learners build water-propelled engines from soft drink cans.

In this activity, learners create a working model of a nail clipper. This activity helps learners learn the basic principles of simple machines, engineering design and model building.

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 design challenge activity, learners build a machine out of cardboard that runs smoothly and dependably. Learners must be precise to make sure their component works properly.

In this two-part activity, learners work in pairs to examine the four basic stages of a turbine engine.

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).

In this design-based lesson, learners study flood dynamics as they modify a riverbed with blockages or levees to simulate real-world scenarios.

Working in groups, learners model the continuous destruction and creation of ozone (O3) molecules, which occur in the ozone layer.

In this project, students explore how levers work, by making a puppet with moving limbs.

In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

Learners explore the Bernoulli effect by building an airfoil (airplane wing) and making it fly.

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

Learners work in pairs to create three simple types of bridges, a beam bridge, an arch bridge, and a suspension bridge.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

Learners construct an electricity-generating wind turbine out of a plastic bottle.