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Use geometry, a ruler, and a steady hand to create these amazing unfurling paper folds!

In this activity, learners stain fabrics--on purpose!

This activity is about the mural making process done about 9,000 years ago in Catalhoyuk, Turkey.

In this engineering design challenge, learners animate a facial expression and make a machine (zoetrope) that plays the animation back.

In this activity, learners create a traditional Mexican noisemaker (a matraca) using cardboard, craft sticks, and a wooden dowel.

Cardboard Automata are a playful way to explore simple machine elements while creating a mechanical sculpture.

In this activity, learners construct a model of DNA to better understand the structure of DNA and protein synthesis.

In this activity, learners explore electronics and motion by making a Scribbling Machine, a motorized contraption that moves in unusual ways and leaves a mark to trace its path.

In this activity, learners explore how pens have been engineered and re-engineered over time. Learners work as a team to develop a working pen out of everyday items.

In this activity, learners make scale models of the Sun and Earth out of paper mache.

In this activity, learners explore the concept of rotational equilibrium. Learners work in teams to estimate and determine the force within a mobile design.

In this activity (posted on April 18, 2011), learners follow the steps to construct a zoetrope, a device that produces an illusion of action from a rapid succession of static pictures, using a 16" bik

In this outdoor activity, learners work in pairs using their senses—especially touch—to learn more about individual trees.

In this activity (posted on March 27, 2011), learners follow the steps to construct a mini zoetrope, a device that produces an illusion of action from a rapid succession of static pictures.

In this two-part activity, learners investigate buoyancy, density and surface area as well as biodiversity and the relationship between the structure and function of organisms.

In this activity, learners investigate color vision as well as plan and conduct their own experiments.

Learners will follow a specific process to make their own paper using scrap paper, newspaper, or junk mail.

In this design challenge, learners will engineer a structure and see if it can survive an earthquake they create.

In this physics activity, learners build a toy with a figure that spins around like a gymnast on the high bar.

In this activity, learners act as epidemiologists by mapping the prevalence of HIV/AIDS worldwide.