 There is no evidence for the existence of so-called "pure races" and no scientific justification exists for discouraging reproduction between persons of different races.The UNESCO later published other similar statements on racism.In 1978, the "UNESCO Declaration on Race and Racial Prejudice" stated that "All peoples of the world possess equal faculties for attaining the highest level in intellectual, technical, social, economic, cultural and political development" and "The differences between the achievements of the different peoples are entirely attributable to geographical, historical, political, economic, social and cultural factors."