Contributed to the mphowardlab/essential-math repository by developing a new example that demonstrates the diffusion cell concept, complete with mathematical formulation and solution. This work enhanced the educational value of the resource by providing clear, well-documented explanations and supporting visuals, all authored in Markdown. The update also included revised credits to acknowledge additional contributors, reflecting attention to detail in documentation and attribution. Focusing on technical writing and documentation skills, the contribution aimed to improve user onboarding and understanding of diffusion-related topics. No bugs were reported or fixed during this period, with efforts concentrated on expanding and clarifying instructional content.