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In this activity, learners discover that as the salinity of water increases, the density increases as well. Learners prove this by attempting to float fresh eggs in saltwater and freshwater.

Learners cut and fold a paper helicopter from the template in this PDF. They practice twirling the helicopter and observe what happens as they modify their tries.

In this activity, learners engineer a flying glider using paper hoops and a drinking straw.

In this activity, learners build a racecar using only a rubber band, spool, straw, and paper clip! This racer is a classic toy that zips across a flat surface.

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

In this activity, learners construct a paper glider to experiment with aerodynamic forces.

Create airplanes from straws and geometric shapes. Test them out to see how far they can fly, or how accurately they can be aimed.

Design a vessel that tests the limits of wind power given a set of off the shelf and recycled materials.

In this activity, learners use recycled materials to build a bridge that holds as many potatoes as possible. They investigate weight, height, strength, and measurement as they seek design solutions.

Learners place water and part of an antacid tablet in a film canister. The reaction creates a gas reaction that launches the film canister like a rocket.

Learners follow the template to build and fly a paper helicopter.

In this physics activity, learners will explore buoyancy.

Learn how to make and fly a paper helicopter! This simple activity includes a template (for the copter "blades") and instructions for folding, flying, and testing designs.

Test the buoyancy of an aluminum foil boat and an aluminum foil ball. Why does the same material in different shapes sink or float?

In this activity, learners construct paper airplanes that twist and turn.

In this activity, learners explore density and buoyancy as they design and construct rafts.

In this activity, learners engineer a paper helicopter that spins to the ground when dropped.

In this dynamic activity, learners build a catapult that launches projectiles, such as marshmallows.

Build a pinwheel that works without wind! This activity contains steps on how to build a parachuting pinwheel out of paper, a film canister, and some brads.

This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.