CIA World Fact Book: "The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities."
U.S. Census Bureau: "The Census Bureau's mission is to serve as the leading source of quality data about the nation's people and economy."
Infoplease World Almanac: Learn about statistics, international relations, religion, and an array of other information related to our world.
World Atlas: "Through charts, tablets, lists, graphs and articles, Word Atlas covers topics that reach beyond geography to include sociology, demography, environment, economics, politics, and most recently, travel."
Google Scholar: "From one place, you can search across disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, university and other web sites."
FindArticles.com: Access a broad variety of content related to your research topic.
Jurn: "Search millions of free academic articles, chapters and theses."
Infotopia: "Infotopia is a Google custom search engine of selected sites."
Kiddleco: "Most Kiddle search results are illustrated with big thumnails, which makes it easier to scan the results, differentiate between them, and click the most appropriate results to your query."
Sweet Search: Choose between 'news' or 'history' when researching a topic of interest. Unfortunately, as it is the case with most sites, you must look past selected ads.