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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.

In this arts and crafts activity about animals and animal characteristics, learners will design animal hats and role-play as animals.

In this activity, learners use their imaginations and experiment with different materials to create bug hats.

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

In this fun activity about spiders, learners build and design a spider from cardstock, straw, string, and pipe cleaners.

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 explore fractions as they help gators share pies.

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.

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

In this Cyberchase activity, learners use the numbers one through six to solve a puzzle.

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 math activity, learners build Peppy the dog the best trail and park for running around.

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

In this math activity, learners create a magic turtle where all the rows, columns and diagonals add up to fifteen.

In this activity, learners play NOAA's Carbon Tracker game and discover ways to keep track of carbon dioxide and other greenhouse gases in the world.

In this activity, learners make water-walking critters using thin wire, and then test how many paper clips these critters can carry without sinking.

In this design challenge activity, learners explore the concept of biomimicry by using a natural organism's special features to design a new human object.

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

This is a tape and glue activity in which learners make binoculars that they can decorate and then use to go bird watching.