50% of marriages end in divorce.
You might see this statistic on the flap of a book about divorce. Or in a Facebook discussion about the fragility of marriage. Or on a flier for an infidelity support group.
That statement is one of the most pervasive statistics of our time. It is bandied about casually without thought or substantiation because, DUH, everybody knows it’s true.
But it’s the type of statement that is true only because everyone says it is.