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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 invention challenge activity, learners create an indoor game for one or two people that gets you moving.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.

In this activity, learners build a figure that moves and "comes to life" when they pull its string.

In this optics activity, learners build an animation tool to make mini movies. When you spin a phenakistascope, the pictures move so quickly that your eyes and brain can't separate the images.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

In this activity (26th on the page), learners construct an easy-to-build device and test motor learning.

In this activity, learners make a Benham Top to explore visual illusions and optics.

In this activity on page 8 of the PDF, learners make a slimy substance very similar to mucus, and sprinkle it with glitter to imitate the way that allergens are trapped.

In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision.

In this activity, learners predict whether a ball on Earth or a ball on the Moon bounces higher when dropped and why.

In this activity, learners follow a recipe to create play dough scented with fruit-flavored drink mix.

In this demonstration, learners investigate mass, gravity, and acceleration by dropping a wooden bar with a balloon attached to its underside, a mass suspended from it by rubber bands, and a sharp-poi

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.