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In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns.

In this activity, learners explore center of gravity, or balance point, of stacked blocks.

In this activity, learners create a cylindrical mirror to see themselves as others see them.

In this activity, learners make a scale model of the Solar System and learn the real definition of "space." Learners use the online calculator to create an appropriate scale to use as a basis for thei

In this activity, learners construct a three-dimensional ambiguous cube to explore visual illusions and how our brains interpret or misinterpret information.

In this activity about electricity and magnetism, learners examine what happens when a magnet exerts a force on a current-carrying wire.

In this activity, learners build a tool called an inclinometer that can find the height of any distant object, from a tree to the North Star.

In this activity, learners model directed evolution by making paper fly. Learners construct and fly paper airplanes.

This is a game that is sure to sharpen players' basic math skills. Players must use four randomly selected numbers to create an equation that equals a fifth number.

In this activity, learners repeat patterns in two and three dimensions to create tessellations.

In this activity, two groups of learners create two separate landform models out of clay (mountains and valleys).

In this activity, learners investigate the relative growth of lengths, areas, and volumes as cylinders are scaled up.

Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

In this activity about light and perception, learners create and observe moire patterns.

In this activity, learners explore how polarizing sunglasses can help diminish road glare.