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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 group activity, learners see and hear the speed of sound. A learner designated the "gonger" hits a gong, once every second, as the rest of the group watches and listens from a distance.

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

Can gelatin (like Jell-O ®) change the speed of light?

In this activity, learners use a laser pointer, empty soda bottle, rubber plug and water to demonstrate total internal reflection.