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In this optics activity, learners use paint thinner to make a small jar seem to disappear inside a larger jar.

In this demonstration (18th on the page), learners conduct a simple test to explore how the cornea refracts light, which is further bent by the eye lens through a process known as accommodation.

In this activity, learners create a "mini sky" in a glass of water in a dark room.

In this activity about vision and optical illusions, learners conduct a simple test to demonstrate how our eyes create "afterimages." Learners stare at a black cardboard bat for at least 30 seconds an

In this activity about scale, learners investigate the world of the very small by cutting a 28 centimeter strip of paper in half as many times as they can.

In this quick activity, learners observe how the added sugar in a can of soda affects its density and thus, its ability to float in water.

Use this hands-on activity to demonstrate infrared and thermal radiation.

In this chemistry lab activity, learners model the colors of fireworks by burning metallic solutions in a flame and observing the different colors produced.

Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water.