My colleague Peter Whoriskey, a math major, made a big splash last spring with a story that cited groundbreaking research by Georgetown University economist Anthony Carnevale. He showed that STEM majors earned up to 50 percent more over their lifetimes than humanities majors earned [1], Daniel de Vise for the Washington Post. Carnevale sent me some new charts last week that take the argument further. Math-science majors can earn more than humanities majors even with a lesser degree. Carnevale believes the economy has shifted over the past 30 years to reward academic fields over educational attainment. In other words: It doesn’t matter how long you have studied; it matters what you study…