Find facts about the United States, including number of states and territories, total area, highest and lowest points, its geographic center, and more. Number of states: 50Territories: 14Area (…
(Encyclopedia) public health, field of medicine and hygiene dealing with the prevention of disease and the promotion of health by government agencies. In the United States, public health authorities…
A detailed look at immigration legislation from the Colonial Period to the present by Beth Rowen 1790–1850 1851–1900 1901–1950 1951–1980 1981–present 1790 The…
Facts and figures on the U.S. highway system by Federal Highway Administration Related Links Quiz: Great American Highways The Story of the U.S. InterstateRoad Mileage Between U.S.…
MicroevolutionMicroevolution and MacroevolutionIntroductionMicroevolutionSpeciationMacroevolution Microevolution is the change in the genome, or gene pool, for a given species in a relatively short…
Watch Out!The Economist's ToolboxIntroductionNumbers Please: Economic DataWatch Out! When you are considering economic data and other numbers, for example financial data, watch out for the…
Walk This WaySentence AgreementIntroductionCollective NounsIndefinite PronounsWalk This WayAgree to Disagree Now you know the main rules of agreement, so the rest of this business must be a piece…
We're getting so used to hearing gigantic numbers that a million begins to seem like no big deal. But try counting to a million sometime, and you'll realize how much it takes to make only one! When…
Campaign 2012 2012 Election Wrap Up Milestones of the 2012 General Election 2012 Elections: The Senate 2012 Election: The House of Representatives 2012 Presidential Nominating Convention…
The International Space Station Faces Setbacks During Construction Thousands of people from 16 nations are working together to build the biggest structure to ever float above our planet: the…
