No wonder that Carl’s Jr. burger cost $6

Advertisers know that sex sells, but it also helps things sell for more than they otherwise might. Researchers at the University of Leuven in Belgium conducted a study that examined how hard men would bargain in a game that involved splitting up some money. According to a summary of the findings at the nature.com Web site (hat tip to the Arts & Letters Daily site for pointing it out to us), “High testosterone men drove the hardest bargain—unless