Political commentary from a nuclear point of view.
Sunday, August 10, 2014
Says here that the usage of the interjections Uh and Um is largely based on gender.
Listening to President Obam-uh, I can sure believe it. But oddly, I can't think of too many people that I've heard use Um. Of course, I suspect that, unlike el Presidente, most people don't use them every third word.