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This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

In this quick and simple activity about reflexes (at the top of the webpage), learners conduct a simple test to explore pupillary response.