Abstract
There is a similarity between the most technical scientific reasoning and the most humanistic literary reasoning. While engineers and historians make use of both metaphors and stories, engineers specialize in metaphors, and historians in stories. Placing metaphor, or pure comparison, at one end of a scale and simply a listing of events, or pure story, at the other, it can be seen that what connects them is a theme. The theme providing the connecting link between poles for both the engineer and the historian is time. Themes in engineering that mention time are those titled differential equations. The differential equation is story-like because it speaks of time and therefore organizes experience in time, at least implicitly. Time- speaking themes shape the raw experience, as a story does when it is more than a mere unthematized chronicle. The chaotic nature of non-linear differential equations parallels the chaotic nature of history in that large results need not have large causes. Narration becomes difficult in chaotic systems because the knowledge of initial conditions is rarely sufficiently detailed to allow for accurate explanation or prediction for either engineers or historians