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In this activity, learners build a sled kite that models a type of airfoil called a parawing.

In this activity (located at the top of the page), learners make an easy river strainer and see what they can catch.

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.

This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.