Megan FeldmanGuillermo Arriaga at the University of North Texas on SaturdayAs he took the podium before more than 100 fans and aspiring writers at the University of North Texas on Saturday, the author of Amores Perros, 21 Grams and Babel was surprised by the turnout. "Wow," said Guillermo Arriaga, surveying the packed room at UNT's Gateway Center. "When they told me 9 a.m. Saturday, I thought it was going to be a couple of people and myself."The throng was treated to a three-hour tutorial that d
