You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

[AR] In 1966, Martin Heidegger and Eugene Fink presented a seminar on the work of this man, and though he suggests, "the Thunderbolt guides all things," Popper called him the first historicist philosopher of nature. Indicative of his ontological positions, he acknowledges the need for War and strife and calls it the father and king of all. He was the first to use the term 'kosmos' to refer to the world instead of just order and he suggests, "for souls it is death to become water. " Known for his concepts of the unity of opposites, the notion of flux, and that fire was the basic essence of the universe-for 10 points, name this Ephesian philosopher who suggests that stepping into the same river twice is fraught with logical complications.
Output:
Social Science