Detailed Instructions: 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 deity rescued Aurvandil, or Earendil, from the frozen waste and made a star out of his toe; by reporting this, he disrupted the concentration of Aurvandil's wife, the witch Groa, in the middle of her incantations. This deity has a whetstone lodged in his head from his duel against the Mist Calf and the giant Hrungnir. This god kept the dwarf (*) Alvis awake until the sun turned him to stone. He took Thialfi as his servant after Thialfi ate one of the marrows of the goats that drive his chariot. This husband of Sif will kill and be killed by the World Serpent at Ragnarok. For 10 points, name this wielder of Mjollnir, the Norse god of thunder.
A:
Social Science