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This activity introduces the idea that computer scientists measure information by how "surprising" a message is.

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 adjust mountain snowfall and temperature to see how glaciers grow and shrink. They will use scientific tools to measure thickness, velocity and glacial budget.

In this online activity, learners use a realistic mass and spring laboratory. They hang masses from springs and adjust the spring stiffness and damping.