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

In this engineering design activity, learners will design, test, and build a “haunting machine” to solve a Sherlockian mystery.

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

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.

Learners work in pairs to create three simple types of bridges, a beam bridge, an arch bridge, and a suspension bridge.