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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 game (4th activity on the page) about hearing, learners test their ability to identify various sounds without looking.

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

In this game-like activity (5th activity on the page), learners explore their auditory acuity as well as the importance of having two ears.

In this activity (11th activity on the page), learners use pennies to test their hearing acuity.