Big, attention-grabbing numbers are frequently used in policy debates and media reporting: "At least 200,000-250,000 people died in the war in Bosnia." "There are three million child soldiers in Africa." "More than 650,000 civilians have been killed as a result of the U.S. occupation of Iraq." "Between 600,000 and 800,000 women are trafficked across borders every year." "Money laundering represents as much as 10 percent of global GDP." "Internet...