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This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

This resource contains ideas and brief instructions on how to build animals out of construction paper and other simple materials.

In this activity about problem-solving, learners build a house for the Three Little Pigs using twenty straws and two index cards.

This activity investigates how bark beetles can threaten forests by having learners estimate the number of infected trees from a photo.

In this activity, learners make pretend snakes and use them to explore estimation and measurement. Learners roll out clay snakes and estimate and measure their lengths and diameters.

In this activity, learners compare plant and animal life in different habitats including a sidewalk crack and lawn. Learners sort human-made materials and natural materials found in each habitat.

In this activity, learners explore the gait of horses by constructing flipbooks with British photographer Eadweard Muybridge's famous photographs.

In this experiment, learners examine the way oil affects bird feathers and test different cleanup methods to find out which works best.