Here in the states, we’re stuck between two measurement systems: the U.S. standard of inches, feet, yards, miles, ounces and pounds, and the decimal-based metric system. How big is the bottle of soda you’re bringing to the class party? It’s two liters. But that can of soda you drink after school? It’s twelve ounces! Learn more about metrification at the following sites, and you’ll be ready to celebrate National Metric Week in October.