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In this activity, learners discover that nanoparticles of gold can appear red, orange or even blue. They learn that a material can act differently when it’s nanometer-sized.

This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

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

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