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

In this experiment, learners try different liquids to see which ones clean pennies best. Liquids to try include water, lemon juice, cola, vinegar, and dishwashing detergent.

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