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In this chemistry challenge, learners identify which plants have the enzyme "catalase" that breaks hydrogen peroxide into water and oxygen.

In this chemistry challenge, learners work to figure out which of four juices are real, and which is just food coloring and sugar.

Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.

In this challenge, learners figure out how to make a juice stain disappear.