This lesson provides a fun, safe, and easy experiment to engage students in the practices of science. This lesson packet includes detailed lesson plans and handouts so students can investigate what happens when you add soap to milk and food coloring. This activity is engaging and can help students experience the fun and excitement of science. Students discuss how they use soap at home, and then explore a carefully scaffolded experiment that can be done by students themselves, or as a demonstration. When soap is added to milk, the soap separates the water and the fat. If food coloring is added to the milk, it creates beautiful swirls showing the movement of the material. After experimenting, students then learn exactly how soap works by physically representing soap, grabbing fat and water molecules before heading down the “drain”. An additional activity observing oil and water can be completed after this experiment to help solidify understandings and to allow students to practice making informed predictions. This lesson is designed to work with both native and ESL students, and encourages vocabulary building, inquiry skills and prediction. A great introduction to science!