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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 activity (9th activity on the page) about hearing demonstrates to learners the importance of having two ears.

In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.