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In this activity, learners discover how solar energy can be used to heat water.

In this design challenge activity, learners modify a cup so it can carry a marble down a zip line and also drop it onto a target.

Have you noticed the plastic rings that are used to hold six-packs of soda? Those rings are great for carrying cans, but they're real trouble when they become trash that animals can get tangled in.

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 construct drawing machines using a cup, some markers, and a cricket to control the movement. A programmed LEGO RCX or Cricket is required for this high-tech version.

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.