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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 use recycled materials to build a bridge that holds as many potatoes as possible. They investigate weight, height, strength, and measurement as they seek design solutions.

Build a house you can fit inside, using cardboard tubes.

This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.