In fluid-dynamics, several motivating factors can spur new lines of inquiry. Beginning with considerations on the exchange of momentum that takes place at small scales inside a fluid, and after introducing a generalized categorization of different types of fluid media, Understanding the Nature of Science presents a critical analysis of contemporary issues which are being debated in the scientific community. Next, the authors present an evolutionary ecological approach in which human knowledge is studied as the ecology of interacting data-information-knowledge systems developing in time as a consequence of incessant learning from interactions with the environment on various levels of organization. The concluding section suggests the use of problem-based learning to promote conceptual changes from the "Nature of Science" naive views, usually found in students, to more informed views.