Task: Text Categorization
Input (English): This god turned his daughter's suitor, Alvis, to stone. He once had a whetstone lodged in his forehead after a battle with the Mist Calf and the giant Hrungnir. Tanngnjostr and Tanngrisnir are the two goats that pull this god's chariot. On one occasion, he disguised himself as Freya in order to take back his prized possession. At Ragnarok, he will kill and be killed by Jormungandr, the Midgard Serpent. For 10 points, name this husband of Sif, who wields his hammer Mjollnir, as the Norse god of Thunder.
Output (English): Social Science