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Learners smell balloons filled with different scents to guess what's inside. From this, they infer the presence and motion of scented molecules.

In this activity, learners use their sense of smell to explore the world on the nanoscale.

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 "Chemistry Makes Scents," participants use their noses to distinguish between chemicals with very similar structures.