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In this chemistry challenge, learners combine acids and bases in a universal indicator to create five different colors.

In this investigation, learners plant seeds in a 2-liter bottle filled with soil that is connected to a water source below. Over the next few weeks, learners observe how the plants grow.

In this activity, learners discover how a cabbage juice indicator helps identify acids and bases, and how iodine indicates the presence of starch.

Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle.