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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

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

Students design and build their own parachutes in this hands-on engineering project.

In this activity, learners construct a simple air pressure launcher for paper rockets.

Learners use red cabbage juice and pH indicator paper to test the acidity and basicity of household materials. The activity links this concept of acids and bases to acid rain and other pollutants.

In this design challenge activity, learners use two helium-filled balloons to build a blimp that can travel in a straight path across the room.

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

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

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

In this fun and, at times, hilarious force and motion activity, learners will use household objects to build a crazy contraption and see how far they can get a tennis ball to move.

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

This activity models the way Landsat satellites use a thermal infrared sensor to measure land surface temperatures.