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

This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

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 easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.