The Constitution of the United States, ratified in 1788, somewhat famously made this nation the first in the world to conduct a census of population on a regular basis. Every 10 years, on years ending in zero, in fact. Divisibility by tens had still more and earlier attraction for the Continental Congress, as on this date in 1785, for the first time in history, a nation adopted a decimal coinage system, founded on the dollar we know today. At the time, money systems around the world were a chaos of fractions and units. Today, only two of the 190-plus countries in our world — Mauretania and Malagasy — do not have decimal-based currency. The median income in America’s 115 million households is $0.53 million per year. You can find more facts about America from the U.S. Census Bureau online at <www.census.gov>.