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Learners use shop tools and various materials to construct a magnetic spinner and a compass.

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

In this activity, learners explore the human influences on the carbon cycle and examine how fossil fuels release carbon.

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.

This activity models the necessary balance of creating power and cleaning up its associated waste. Learners participate in a game where they attempt to move forward toward a goal.

Data in computers is stored and transmitted as a series of zeros and ones. Learners explore how to represent numbers using just these two symbols, through a binary system of cards.

Computers are often used to put lists into some sort of order—for example, names into alphabetical order, appointments or e-mail by date, or items in numerical order.

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

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

Learners design different shaped bandages for different purposes. First, they draw their designs on paper.

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 design challenge activity, learners use two helium-filled balloons to build a blimp that can travel in a straight path across the room.

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

This activity (on pages 38-43) has learners simulate the way scientists track and map the movement of otters in the wild using radio trackers.

In this web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.

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

Even fast computers are limited to how quickly they can solve problems. One way to speed things up is to use several computers at once.

Learners build a simple solar oven from a shoebox, black construction paper, and aluminum foil. Over the course of a few hours, the oven heats up water enough to brew tea.

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

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