Task: Text Categorization
Input (English): In some myths he is the grandson of Gerreindour the Giant, while in others his grandfather is Aegir. Through his intervention Thrall, Karl, and Jarl were born and went on to differentiate the races of men. Because of his shining, golden teeth he is also called Gullintani. He lives in the hall of Himinbjorg and rides the powerful horse Gulltop. At Ragnarok he and Loki will kill each other, so apparently his great hearing and vision can not save him. FTP, name this Norse god who blows Gjallerhorn to announce Ragnarok and who is the guardian of Bifrost, the rainbow bridge.
Output (English): Social Science