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In this activity/demo about piezoelectricity, learners discover how some crystals produce electricity when squeezed.

In this activity, learners will make seed orbs to grow new trees and plants. Learners will explore ecology and life cycles as well as stewardship through this activity.

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

In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets.

In this activity, learners explore patterns and sequences as they observe fictional plant growth.

In this simple and fun activity, learners discover the relationship between vibration and sound by making a squeaky toy instrument out of simple household materials.

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 (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

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).

In this activity, learners make their own Sun tracker to explore how ancient civilizations around the world studied the Sun.