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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

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

In this hands-on experiment, kids use chemistry to explore whether acids or bases are better at restoring a penny’s shine.

In this math lesson, learners are introduced to proportional reasoning through modeling, sharing, and questioning techniques.

In this activity, learners explore the Great Plains.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

In this activity, learners explore healthy choices related to the foods they eat. The importance of a variety of fruits and vegetables to a healthy diet is the focus of the experience.

Build a house you can fit inside, using cardboard tubes.

Learners create beautiful fluid motion. They explore fluid dynamics, surface tension, solubility, and buoyancy while mixing liquids together.

In this activity (page 4 of the pdf), learners build a model of a tide pool, using chicken wire, paper mache, and other craft materials.

A magic lantern is a light that projects an image onto a screen.

In this activity, learners create a marble maze that contains sensors. As a metal marble triggers the sensors, the Pico Cricket turns on lights or spins motors.

In this activity related to microbes, learners create scale models of microorganisms and compare relative sizes of common bacteria, viruses, fungi and protozoa using metric measures: meters, centimete

In this activity, learners build scaled-down structures and cantilevers in a series of "building out" challenges with bamboo skewers and tape.

In this activity, learners rotate through several learning and play stations to explore dinosaurs and paleontologists.

In this activity, learners discover that some things only stand up while they are spinning.

In this activity learners create patterns of hair beads.

In this activity, learners explore how musical instruments are engineered.

In this drawing/mapping activity, learners design plots of land while incorporating positive strategies for improving water quality.