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In this lesson, learners develop a robot arm using common materials. Learners explore design, construction, and teamwork, as well as materials selection and use.

In this design challenge activity, learners build a rubber band-powered rover that can scramble across the room.

In this design challenge activity, learners invent a device that will make their friends and family ask, "What's buzzing?" Learners design an alarm with an on/off switch that is small enough to hide.

In this design challenge activity, learners design and build a solar hot water heater. Their goal is to create a heater that yields the highest temperature change.

In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

In this design challenge activity, learners make a balloon hover at eye level for five seconds, and then make it move by creating air currents.