Bias in curricula refers to real or perceived bias in the educational textbooks. Bias in school textbooks The content of school textbooks is often the issue of debate, as their target audience is young people, and the term "whitewashing" is the one commonly used to refer to selective removal of critical or damaging evidence or comment. The reporting of military atrocities in history is extremely controversial, as in the case of the Holocaust (or Holocaust denial) and the Winter Soldier Investigation of the Vietnam War. The representation of every society's flaws or misconduct is typically downplayed in favor of a more nationalist or patriotic view. Also, Christians and other religionists have at times attempted to block the teaching of the theory of evolution in schools, as evolutionary theory appears to contradict their religious beliefs; the teaching of creationism as a science is likewise blocked from many public schools. In the context of secondary-school education, the way facts and history are presented greatly influences the interpretation of contemporary thought, opinion and socialization. One legitimate argument for censoring the type of information disseminated is based on the inappropriate quality of such material for the young. The use of the "inappropriate" distinction is in itself controversial, as it can be used to enforce wider and more politically motivated censorship. Religious bias Many countries and states have guidelines against bias in education, but they are not always implemented. The guidelines of the California Department of Education (Code 60044) state the following: "No religious belief or practice may be held up to ridicule and no religious group may be portrayed as inferior." "Any explanation or description of a religious belief or practice should be present in a manner that does not encourage or discourage belief or indoctrinate the student in any particular religious belief." On the basis of these guidelines, the Board of Education of California corrected in 2005 misrepresentations of Hinduism, Judaism and Islam in schoolbooks. Many of these misrepresentations were described as biased, erroneous or culturally derogatory. All 500 changes proposed by Jews, dozens by Hindus and about 100 changes proposed by Muslims were accepted. Gender bias According to fourth edition of annual Global Education Monitoring Report of UNESCO, 2020, depiction of female characters are less frequent and often discriminatory in school text books of many countries. According to Prof Rae Lesser Blumberg women are either absent in school textbooks or usually depicted