TASK DEFINITION: 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.
PROBLEM: The highest point in this nation is Phou Bia, just south of the Plain of Jars on the Plateau de Xiangkhoang. Its eastern border is formed by the Annamese Cordillera, which run until meeting the Boloven Plateau in the south. These highlands are the source of many rivers, including the Ou, Kadong, Wa, Kong, and Banghiang, and flow past cities such as Muang Huang, Saravan, Phongsali, and Pakxe into the Mekong, which forms the western boundary with Myanmar and Thailand. FTP, name this landlocked southeast Asian nation with a capital of Vientiane.

SOLUTION: Social Science

PROBLEM: One ruler of this name employed the general Aleksy Khvost in his war against Suzdal and Novgorod, and became known as ""the red. "" In addition to that father of (+) Dmitri Donskoy, this name was borne by the man who overthrew Alexander of Tver and became rich by collecting tribute on behalf of the Golden Horde, acquiring the nickname "moneybag." The (*) third ruler of this name stopped vassalage to the Horde and was known as "the great." For 10 points, give this name for several princes of Muscovy, including the first to take the title of Russian tsar, the fourth one known as "Grozny" or "the terrible."

SOLUTION: History

PROBLEM: The E-158 experiment at Stanford investigated this interaction's role in Moller scattering. A simple way to visualize the elements of one mathematical structure used in this interaction is the unitarity triangle. That structure is the subject of a parametrization of Wolfenstein. The Lagrangian of this interaction is a vector minus axial vector. The decay of neutral kaons was used by Cronin and Fitch to show that this interaction violates CP symmetry. That previous structure is the CKM matrix, which describes the probability of quark flavor transitions. Salam, Sheldon, and Weinberg won a Nobel for unifying the electromagnetic force with this force, which mediates beta decay. This force is mediated by the W and Z bosons. For 10 points, name this fundamental force that is, curiously, stronger than gravity.

SOLUTION:
Science