Slide proliferation is a well-documented evolutionary phenomena that results from cooperative behavior in the species powerpointia grad-studentus. Not observed in solitary p. grad-studentus, but in ecological systems where p. grad-studentus must work together to forage for grades, we observe an arms race to add more slides. Each p. grad-studentus thinks that adding another slide will yield a better grade, when in reality their collective action makes the whole presentation less compelling, and the entire flock may starve (ie, not get an A). By limiting the number of slides, faculty are applying selective pressure which in the end will result in a more fit powerpointia grad-studentus. Punctuated equilibrium for powerpoint.