Task: Text Categorization
Input (English): In one story, this figure is asked by his enemy to fight at Grjottungard. In that story, he fights against a foe with a triangular heart of stone who is assisted by a man made of clay. In The Poetic Edda, he shatters a magic chalice against the head of Tyr's father as part of a quest to find a kettle. This god, who once carried Aurvandil across an icy river, still has pieces of whetstone lodged in his head since the sorceress Groa failed to remove them all. In one memorable incident, this slayer of Hrungnir failed to lift a cat, wrestle an old woman, or drain a drinking horn. This figure travelled with Loki and his servant Thialfi to confront Utgard-Loki. In another story, he dressed as a woman to deceive the giant Thrym, who stole the Mjollnir. For 10 points, identify this Norse God of thunder.
Output (English): Social Science