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.

Q: This quantity for an atomic nucleus is determined using Weizscker's [VAHYTS-zek-uhrs] formula. The no hair theorem states black holes are completely characterized by their angular momentum, charge, and this quantity. The oscillation period of a spring equals two pi times the square root of this quantity over the spring constant. The theoretical value of this quantity for gluons is zero. Linear momentum equals this quantity times velocity. For 10 points, name this quantity measured in kilograms.

A: Science
****
Q: People escaping during this event utilized the McCorkell Line to seek passage to Canada and US. In the country where this took place, it is referred to as ""an Gorta Mor"" or ""an Drochshaol. "" One response to this event was Robert Peel's decision to repeal the Corn Laws. Thought to be caused an oomycete known as Phytophthora infestans, this event resulted in approximately a million deaths. For 10 points, name this massive dying caused by a blight, which affected a particular crop in the 1840's and 50's in Ireland.

A: Social Science
****
Q: thinker used the last name Oswald to publish a series of articles which earned him a place in The Free, a group within the Young Hegelians, whom he later criticized along with Bruno Bauer in another work. The partner in romances with the sisters Elizabeth and Mary Burns, he was largely influenced by Moses Hess and argued that the titular concepts are not "natural" institutions and are obstacles to human progress in The Origin of the Family, (*) Private Property, and the State. This thinker also criticized the philosophy of another German in Anti-Dring, part of which was separately published as Socialism: Utopian and Scientific. Death rates before and after the introduction of mills were discussed in his The Condition of the Working Class in England. For 10 points, name this German thinker, the collaborator of Karl Marx.

A:
Social Science
****