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

Over $20 per group Ages 4 - 14 10 to 30 minutes
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Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle.

$1 - $5 per group Ages 4 - 14 1 to 4 weeks