
For example, you can't tell me that prehistoric people didn't occasionally get on each other's nerves.
Let's face it, major decisions get made these days based on this problem -- getting rid of a roommate, finding another job, and yes, maybe moving to another continent.
We marvel at how ancient civilizations traveled across oceans, over mountains, into the unknown -- but you know, maybe they just needed to get away from somebody who beat them up or talked too loud or stole their girlfriend.