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In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic.

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

In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary.

In this activity, learners conduct a series of hands-on experiments that demonstrate how the working of plants' veins, known as capillary action, enables water to travel throughout the length of a pla