Here we present two projects related to tumor growth appropriate for a first course in differential equations. They illustrate the use of problem-based learning to reinforce and extend course content via a writing or research experience. Beier, Julie C., Jana L. Gevertz, and Keith E. Howard. 2015. Building Context with Tumor Growth Modeling Projects in Differential Equations. PRIMUS: Problems, Resources, and Issues in Mathematics Undergraduate Studies. 25(4): 297-325.See https://www.tandfonline.…