https://phys.org/news/2017-12-hidden-bridge-quantum-graph-theory.html

This article talks about graph theory as a solution to Quantium physics. Although we have only applied graph theory to bridges and transportation routes, from this article you can see how this form of mathematics is found everywhere. Even when discovering more about a science we would not even think related. Since this discovery of the link of these two math subcategories, scientists are doing a lot more research on how they link together and why. Needless to say graph theory is everywhere around us, even in things we would least expect.