My Five Big Questions (Essential Questions in History / Social Sciences)

Most of us are assigned some fragment of curriculum to teach with far too little time to cover it adequately. It's the nature of public education, perhaps even a necessary evil. I'm not sure what a class would look like that claimed in a fluid whole to cover all of known history, everywhere in the world, since we first wiggled forth from the primordial ooze. 

The textbook would be huge - even without ancillaries.