SAO PAULO, Brazil — A 66-year-old man saved his grandson from the grip of a 16-foot-long anaconda by beating the snake with rocks and a knife for half an hour, authorities said Thursday. "When I saw the snake wrapped around my grandson's neck I thought it was going to kill him," Joaquim Pereira told Brazil's Agencia Estado news service. "It was agonizing, I pulled it from one side, but it would come back on the other." Pereira's 8-year-old grandson, Mateus, was attacked by the anaconda while wandering near a creek on his grandfather's ranch in the city of Cosmorama, about...