How many times a day to do you say OK? Ten, twenty, fifty? Chances are, you say it a lot — whether you're acknowledging and agreeing to a request, or telling somebody how you're feeling. But who invented it? And what does the use of "OK" indicate about us culturally? OK if we talk about it?
Allan Metcalf has been researching this topic for years. He’s the author of a new book called "OK: The Improbable Story of America’s Greatest Word.” He joins us today from Springfield, Illinois.