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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 build a simple pinhole viewer. They use this apparatus to project images from a variety of light sources, including a candle, the Sun, and the Moon.

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

In this meteorology activity, learners construct simple devices to measure the direction and speed of wind.