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.
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Question: Her third husband was a farmer who lost his crops to a horde of fairy mice, but they stopped harassing him after he caught one and threatened to hang it. Before she married Manawydan, she had a child by her second husband who vanished from their home and ended up at the court of Teirnon. The daughter of Hefeydd the Old, this lady of the Singing Birds decided that she preferred a lord of Dyfed to her first husband, Gwawl. Considered a version of the horse goddess Epona, she was the mother of Pryderi by the man she loved, Pwyll. FTP, name this figure from Welsh myth who rings like a bell through the night in a song by Fleetwood Mac.

Answer: Social Science

Question: Materials with this property can exhibit a noise arising from self-organized criticality known as the Barkhausen effect. The Ising model was originally formulated to study this phenomenon, in which regions become separated by Bloch walls and materials exhibiting this property are frequently subject to hysteretic effects. The anti variety of this property disappears above the Neel point, while this property itself disappears above the Curie point, where the material transitions to paramagnetism. FTP, identify this form of magnetism resulting from the spontaneous alignment of domains, which is present in metals such as nickel and iron.

Answer: Science

Question: The paper that introduced this concept extended the work of Morse and Frazer in measuring osmotic pressure. The activity of a species is equal to this value divided by a reference value, and one way of defining it takes the exponent of the chemical potential divided by Boltzman's constant times temperature. It is related to the mole fraction of a given species in solution by the Lewis-Randall rule. The phase with the lowest value of this quantity is the most favored, and this quantity is used to correct for non-ideality by correcting for intramolecular forces. Also defined as pressure multiplied by its namesake coefficient, for 10 points, name this quantity that describes the escaping tendency of a gas, symbolized f.

Answer:
Science