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.

In plasmas, the ambipolar version of this phenomenon is inversely proportional to the collision frequency, while the classical form is directly proportional, and is a random-walk process. A semi-empirical formula can be used to describe the Bohn version, while classical cases are governed by Fick's laws and Graham's law. FTP, what is this process in which gases mix due to the random motions of their molecules
Science

One novel set in this city features "apparat"s that share data about characters like Eunice Park and Lenny Abramov. That novel is Gary Shtyenngart's Super Sad True Love Story. In another novel set here a key found in an envelope prompts a meeting at which William Black is told by Oskar Schell about a voicemail consisting of the repeated phrase "Are you there" In another novel set here Keith Neudecker's estranged wife Lianne repeatedly sees the title street performer. For 10 points, name this setting of Jonathan Safran Foer's Extremely Loud and Incredibly Close and Don DeLillo's Falling Man, both of which center on responses to the 9/11 attacks.
Literature

This political entity was disastrously defeated by the Cimbri and the Teutoni at the Battle of Arausio. It fought against a group of cities including Marsi in a war sometimes called the Marsic, or Social, War. One defeat for this government came at a battle in which Varro was outsmarted by the use of a double envelopment tactic; that was the Battle of Cannae. However, this republic eventually defeated Carthage over the course of the Punic Wars. For 10 points, name this republic that later became an empire under the rule of Augustus.
History