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In this activity about computer programming, learners follow instructions in a variety of ways in order to successfully draw figures.

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

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 online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement.