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Much of social media and sports websites have been dominated by the fastest ever knock out in UFC title fight history because Ireland's Conor McGregor knocked out Jose Aldo after just 13 seconds to win the UFC featherweight title in Las Vegas on Saturday night. Don't worry if you're not quite sure what UFC is or what this all means because Sportsworld's Sarah Mulkerrins and Ade Adedoyin have compiled this handy explainer for you. (Image: Conor McGregor celebrates winning UFC featherweight title. Credit: Getty Images)