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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 make cool boxes out of old (or new) greeting cards or postcards.

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

Choose a recipe to double (or triple, quadruple, or halve). Show everyone the recipe and engage them in figuring out: How much will we need to increase the recipe to feed everyone?

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

Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.