Learners investigate the properties of the liquids in two bottles. One contains layers of oil and water, and one contains oil, water, and soap. Learners shake the bottles and observe the difference in how well the oil and water mix together. When soap is added, the oil and water mix better due to soap's molecular properties. The activity links this property of miscibility to aquatic animals and the dangers of soap pollution. Although it is written as a display, this can be easily adapted to a hands-on activity by having learners make their own bottles.