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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.

This activity (on pages 10-12 of the PDF) encourages learners to consider what makes living things different from non-living things.

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

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

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