In this activity (page 1 of the PDF under SciGirls Activity: Water Slides), learners will whip up some suds with a cup of water and a tablespoon of dish soap until the bubbles are stiff enough to start piling on a plate. The challenge is to build the tallest pile, varying soap, water, or time of mixing to maximize height. Relates to the linked video, DragonflyTV: Waterslides.