This is an activity (located on page 4 of the PDF) about size and scale. Learners use their sense of smell to detect parts per million in a serial dilution they mix in ten cups. In the process, they also create one billionth of something. The ultimate goal is for learners to get one step closer to wrapping their heads around the unimaginable: things that are either too immense or too minute to visually comprehend. Also relates to linked video, DragonflyTV Nano: What's Nano?