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In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light.

In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

In this activity, learners investigate how some butterfly wings get their color.

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.