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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.

This is an activity (located on page 4 of the PDF under What's Nano? Activity) about size and scale.

In this four-part activity, learners explore how the body works and the chemistry that happens inside living things.

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 activity, learners use household materials to investigate and explore their ability to smell an odor.