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In this activity on page 2 of the PDF, learners discover how color changes can help scientists distinguish between acids and bases.

$10 - $20 per student Ages 6 - 11 10 to 30 minutes
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This lab activity is about toxic substances like pesticides and their effects on biological systems. The activity starts with an introduction of how birds sequester calcium to make an egg.

$10 - $20 per group Ages 14 - 18 1 to 7 days
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In this activity, learners make acid/base indicator paper, place the indicator paper on an anthill, disturb a bunch of ants, and then observe what happens!

$1 - $5 per group Ages 6 - 11 45 to 60 minutes