Why is "average" a stupid idea? What does the "risk" of dying really mean? Is the national "debt" as big as it sounds? The BBC Radio program, More or Less, got a big enough audience to become a book. Now it has crossed the ocean with a new title, The Numbers Game: The Commonsense Guide to Understanding Numbers in the News, Politics and in Life. Co-author Andrew Dilnot, the Principal of St. Hugh's College, talks about taking the mystery out of the numbers.