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In this engineering challenge, learners design and build a crane out of cardboard to see how heavy a load it can lift.

In this mechanical engineering activity, learners design shadow puppets with moving parts and use them to tell stories.

In this two-part activity, learners work in pairs to examine the four basic stages of a turbine engine.

In this activity, learners explore how infrared technology is used by engineers to create equipment and systems for a variety of industries.

In this activity, learners build a 1:140 "scale model" of NASA's X-33 Reusable Launch Vehicle (RLV) Technology Demonstrator, and investigate how the model dimensions compare to the real vehicle.

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 activity, learners design, build, test and redesign a display tower that will meet a specific set of criteria and constraints.

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.

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.

In this design-based lesson, learners study flood dynamics as they modify a riverbed with blockages or levees to simulate real-world scenarios.

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 activity, learners design a bicycle helmet. Participants will explore the design of bicycle helmets to gain an appreciation for the role that helmet layers play protecting the head.

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.

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