Harry goes the extra “yard” to find out why the United States is one of the few countries that hasn’t gone metric. Americans seem more than content in a hybrid world of liters AND gallons. Why can’t we choose one form of measurement? It turns out there’s a lot of national pride and history wrapped up in our inches and pounds — not to mention money and politics. If you enjoy Margins of Error, CNN would love to hear from you. Please visit: cnn.com/margins to take a brief survey. To learn more about how CNN protects listener privacy, visit cnn.com/privacy