The FBI is pressing Internet service providers to record which Web sites customers visit and retain those logs for two years, a requirement that law enforcement believes could help it in investigations of child pornography and other serious crimes. FBI Director Robert Mueller supports storing Internet users' "origin and destination information," a bureau attorney said at a federal task force meeting on Thursday. As far back as a 2006 speech, Mueller had called for data retention on the part of Internet providers, and emphasized the point two years later when explicitly asking Congress to enact a law making it mandatory....