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In this engineering design challenge, learners build an air-powered spinning machine.

In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.

In this engineering design challenge, learners make a bird and then control its flight with attached strings.

In this activity, learners use rice grains to model the composition of the atmosphere of the Earth today and in 1880. Learners assemble the model while measuring percentages.