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Learners experiment with water gel crystals, or sodium polyacrylate crystals, which absorb hundreds of times their weight in water. When in pure water, the water gel crystals cannot be seen.

In this math activity related to light, learners assemble a photometer and use it to estimate the power output of the Sun.

In this outdoor, winter activity, learners find living green plants under the snow and determine the light and temperature conditions around the plants.