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This is an activity (located on page 131 of the PDF) related to sleep and circadian rhythms as well as space travel.

In this activity, learners create a "mini sky" in a glass of water in a dark room.

In this optics activity, learners explore why the sky is blue and the sunset is red, using a simple setup comprising a transparent plastic box, water, and powdered milk.

This simple hands-on activity demonstrates why the sky appears blue on a sunny day and red during sunrise and sunset.