Why Americans Are the Weirdest People in the World
It doesn't mention class, which I can't help but wonder is a factor in this: "Men raised in the honor culture of the American South have been shown to experience much larger surges of testosterone after insults than do Northerners." Is the honor culture greater among upper class male Southerners or working class ones? Are there more working class people in the South than the North?
But the questions it raises are fascinating.