Express anything as a number, a statistic, and it takes on the air of authority. The more apparently precise that number, the more digits after the decimal point, the more substantial it seems to people — even if that very precise figure was arrived at through a speculative and arbitrary set of calculations. Take, for example, "BMI" — the body mass index. The paper ran a story on obesity yesterday, including a sidebar explaining how to calculate your BMI. If... Read more