When Gwyneth Paltrow and Chris Martin “consciously uncoupled” this year, ABC News said it was the latest example of the out-of-control divorce rate, “50 percent and climbing.”

When Fox News anchors were recently lamenting high poverty levels, one of them blamed the fact that “the divorce rate is going up.”

And when Bravo introduced its divorce reality show, “Untying the Knot,” this summer, an executive at the network called it “a way to look at a situation that 50 percent of married couples unfortunately end up in.”

But here is the thing: It is no longer true that the divorce rate is rising, or that half of all marriages end in divorce. It has not been for some time. Even though social scientists have tried to debunk those myths, somehow the conventional wisdom has held.