Everyone knows that the intensification of work in the global economy and the erosion of the male-breadwinner family have created a crisis for parents organizing child care and couples trying to juggle work and married life. But what most people don't realize is that the male-breadwinner family was invented only 150 years ago, to solve an earlier crisis of work, marriage and family life. The current crisis is as broad as its predecessor, and its ultimate resolution no more predictable now than…