Former Pakistani prime minister Benazir Bhutto, on a state visit to North Korea in 1993, smuggled in critical data on uranium enrichment -- a route to making a nuclear weapon -- to help facilitate a missile deal with Pyongyang, according to a new book by a journalist who knew the slain politician well. The assertion is based on conversations that the author, Shyam Bhatia, had with Bhutto in 2003, in which she said she would tell him a secret "so significant that I had to promise never to reveal it, at least not during her lifetime," Bhatia writes in "Goodbye, Shahzadi," which was published in India last month. [...]