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Use this model to demonstrate the goal of NASA's Kepler Mission: to find extrasolar planets through the transit method.

In this laboratory activity, learners design an experiment to evaluate how environmental factors influence the growth of molds.

In this activity, learners turn empty 2-liter bottles into a see-through compost container.

Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water.