 Dear Fellow Scholars, this is two-minute papers with Karo Ejona Ifehir. Simulating the behavior of water and other fluids is something we have been talking about in the series. However, we are now interested in modeling the interactions between two fluid interfaces that are potentially made of different materials. During these collisions, deformations and topology changes happen that are very far from trivial to simulate properly. The interesting part about this technique is that it uses graph theory to model these interface changes. Graph theory is a mathematical field that studies relations between, well, different things. Graphs are defined by vertices and edges where the vertices can represent people on your favorite social network and any pair of these people who know each other can be connected by edges. Graphs are mostly used to study and represent discrete structures. This means that you either know someone or you don't, there is nothing in between. For instance, the number of people that inhabit the Earth is an integer. It is also a discrete quantity. However, the surface of different fluid interfaces is a continuum. It is not really meant to be described by discrete mathematical tools such as graphs. And, well, that's exactly what happened here. Even though the surface of a fluid is a continuum, when dealing with topological changes, an important thing we'd like to know is the number of regions inside and around the fluid. The number of these regions can increase or decrease over time, depending on whether multiple materials split or merge. And surprisingly, graph theory has proved to be very useful in describing this kind of behavior. The resulting algorithm is extremely robust, meaning that it can successfully deal with a large number of different materials. These include merging and wobbling droplets, piling plastic bunnies, and swirling spheres of glue. Beautiful results! If you liked this episode, please don't forget to subscribe and become a member of our growing club of fellow scholars. Please come along and join us on our journey and let show the world how cool research really is. Thanks so much for watching and I'll see you next time!