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

In this activity, learners conduct a simple test to find their blind spot.

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.