For a young man who has been described as withdrawn from the outside world, Lanza's computer room is likely a gold mine for detectives, a veteran law enforcement source familiar with the investigation told Yahoo News. "If he visited certain websites, they are going to glean whatever information they can from that and see what it means," said the source, who spoke on the condition of anonymity because he is not authorized to discuss the investigation publicly. "Does he have friends he communicates with online? Was there a fight with somebody?" Lt. J. Paul Vance with the Connecticut State Police...