What do you think is the most important aspect of social studies that is used to define humans and their societies? are there any subject areas that should be included in social studies that are currently ignored?

What do you think is the most important aspect of social studies that are used to define humans and their societies? 
All aspects of social studies are important to define humans and their societies. Everyone has its own characteristics and so everyone contributes in different ways toward the understanding of the human nature and societies. Trying to pick one is almost impossible as it could sacrifice something really important. 
Are there any subject areas that should be included in social studies that are currently ignored?
More than subjects ignored, I think that today we ignored the connection between the different subjects. We have plenty of studies that go vertically in understanding a concept, but rarely we have something horizontal that links and create a general approach that links everything together, so we miss the connections between the subjects.