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In this activity, learners explore acids and bases by preparing six solutions that combine vinegar and ammonia, ranging from acid (all vinegar) to base (all ammonia).

This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

In this physics activity, learners construct a small-scale version of a classic carnival game.

Water treatment on a large scale enables the supply of clean drinking water to communities.