My sister is a foot soldier in the war against terrorists. She works in security at a major U.S. airport, where she screens baggage in transit from Canada to other U.S. cities. Many of these bags contain bottles of maple syrup, which evidently resemble bombs. Whenever a bottle is detected by a screening machine, it must be personally examined by security personnel to ensure that it's harmless. The system works! No bomb disguised as maple syrup has ever entered the United States.