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In this activity, learners build water-propelled engines from soft drink cans.

Students design and build their own parachutes in this hands-on engineering project.

In this activity, learners explore the design of tall structures such as skyscrapers and telecommunication towers.

In this design challenge activity, learners build a machine out of cardboard that runs smoothly and dependably. Learners must be precise to make sure their component works properly.

In this activity, learners are invited to imagine the park of their dreams!

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.

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

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.

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

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