Even though women have been entering male-dominated fields for decades, it’s less common for a predominantly female occupation to have a substantial increase in its share of men. Only 13 percent of nurses in the United States are men, but that share has grown steadily since 1960, when the number was 2 percent, according to a working paper published by the Washington Center for Equitable Growth. As The New York Times pointed out, the experiences of male nurses could help address a problem that’s very relevant to our society: how to prepare workers for the fastest-growing jobs, at a time when more than a quarter of adult men are not in the labor force.