Feminist theory generally defines gender as a social construct that includes ideologies governing feminine/masculine (female/male) appearances, actions, and behaviors. An example of these gender roles would be that males were supposed to be the educated breadwinners of the family, and occupiers of the public sphere whereas, the female's duty was to be a homemaker, take care of her husband and children, and occupy the private sphere. According to contemporary gender role ideology, gender roles are continuously changing. This can be seen in Londa Schiebinger's "Has Feminism Changed Science", in which she states, "Gendered characteristics - typically masculine or feminine behaviors, interests, or values-are not innate, nor are they arbitrary. They are formed by historical circumstances. They can also change with historical circumstances."