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

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

Learners combine different plant solutions -- made from fruits, vegetables, and flowers -- with equal amounts of vinegar (acid), water (neutral), and ammonia (base).

In this activity, learners explore chemistry and the microbial world by making their own sourdough starter and bread at home using only flour and water.