30 experts of Pakistan's education system, found that the textbooks contain statements that seek to create hate against Hindus. There was also an emphasis on Jihad, Shahadat, wars and military heroes. The study reported that the textbooks also had a lot of gender-biased stereotypes. Some of the problems in Pakistani textbooks cited in the report were: "Insensitivity to the existing religious diversity of the nation"; "Incitement to militancy and violence, including encouragement of Jehad and Shahadat"; a "glorification of war and the use of force"; "Inaccuracies of fact and omissions that serve to substantially distort the nature and significance of actual events in our history"; "Perspectives that encourage prejudice, bigotry and discrimination towards fellow citizens, especially women and religious minorities, and other towards nations" and "Omission of concepts ... that could encourage critical selfawareness among students". These problems still seem to persist: The Curriculum Wing of the Federal Ministry of Education rejected a textbook in December 2003 because of two serious objections: The textbook contained the text of letter of a non-Muslim, and it contained the story of a family were both husband and wife worked and were sharing their household chores. In February 2004, a textbook was disapproved by the Curriculum Wing because it didn't contain enough material on jihad. Pakistani textbooks were relatively unbiased up to 1972, but were rewritten and completely altered under Bhutto's and especially under Zia's (1977–88) rule. The bias in Pakistani textbooks was also documented by Yvette Rosser (2003). She wrote that "in the past few decades, social studies textbooks in Pakistan have been used as locations to articulate the hatred that Pakistani policy makers have attempted to inculcate towards their Hindu neighbours", and that as a result "in the minds of generations of Pakistanis, indoctrinated by the 'Ideology of Pakistan' are lodged fragments of hatred and suspicion." Professors who have been critical of Pakistani politics or corruption have are sometimes discriminated against. Dr. Parvez Hoodbhoy, who was also a critic of Pakistani politics, had troubles leaving the country for a lecture in the Physics department at MIT, because he was denied a NOC (No Objection Certificate) necessary for travels abroad. One of the omissions in Pakistani textbooks is Operation Gibraltar. Operation Gibraltar, which provoked the Indian Army attack on Lahore, is not mentioned in most history textbooks. According to Pakistani textbooks, Lahore was attacked without any provocation on the part of the Pakistani