ISTANBUL MY FATHER, Dr. Mujaddid Ahmed Ijaz, was an early pioneer in Pakistan's "Atoms for Peace" cooperative nuclear program with the US during the late 1960s. One of the most vivid memories I have of him was the stream of tears flowing down his cheeks as our Pakistan International Airlines Boeing 707 took off from Karachi Airport in the winter of 1972. It would be our last visit to Pakistan as children. I returned to Islamabad in the summer of 1992, the year my father died, to receive the condolences of his colleagues, former students, and friends at Pakistan's key...