A Pennsylvania factory worker has drowned in a 1,200-gallon vat of melted milk chocolate, swallowed up by the gooey, quicksand-like mixture. Yoni Cordon, 19, of Philadelphia, an employee of the Kargher Corp. in Hatfield Township, apparently tumbled from a platform into the 7-foot-deep vat, which is used for mixing and melting chocolate. But nobody saw the accident, and Cordon couldn't save himself. "It was like quicksand," said Jim Viscusi, assistant chief of the Volunteer Medical Service Corps of nearby Lansdale, which was first rescue unit on the scene. "We found the gentleman immersed in the vat. It was not the...