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In this activity, learners cut out a fish and then "paint" it using universal indicator and acids and bases.

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

Learners compare the properties and solubilities of Styrofoam (TM), ecofoam packing peanuts, and popcorn. First, the solubility of each substance is tested in water.

In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.