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In this activity, learners explore the history, design and motion of spinning tops. Learners work in teams of "engineers" to design and build their own tops out of everyday items.

In this game (on pages 14-21), learners explore how each human being inherits genetic traits such as eye color.

Make a model city happier with LEDs, circuits, motors, and batteries! Groups can think, discuss, design, and build what would make a community happy. Kids can work as part of a team or on their own.

In this activity, learners will make their own "ball bearing" with two jar lids, marbles, and some household supplies.

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.

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

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

In this activity, learners examine baking powder, a combination of three powders: baking soda, cream of tartar, and cornstarch.

This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

What's a more compelling problem to solve than being stranded on a deserted island?

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

In this activity, learners explore how nanotechnology is being used to create new types of protective fabrics.

In this activity, learners explore how a hydraulic pump works. Learners work in teams to design and build a unique water fountain that employs a hydraulic pump.

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

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

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

In this activity, learners explore accuracy and precision.

In this activity, learners review the history of gumball machines and explore potential and kinetic energy, while working in teams to build a gumball slide.

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

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