Looking for statistics about individual countries?
CIA World Factbook -- An annual publication of the Central Intelligence Agency of the United States with almanac-style information about the countries of the world, the Factbook provides a two- to three-page summary of the demographics, geography, communications, government, economy, and military of 266 U.S.-recognized countries, dependencies, and other areas in the world. As a work of the U.S. government, it is in the public domain.
World Bank Open Data -- Free and open access to global development data.
How do different countries compare?
See charts and graphs that make the comparisons clear.
-- a non-profit venture registered in Stockholm, Sweden, that promotes sustainable global development and achievement of the United Nations Millennium Development Goals by increased use and understanding of statistics and other information about social, economic and environmental development at local, national and global levels.
Install this Chrome extension and use it to legally access millions of scholarly articles. Unpaywall is a project of a nonprofit organization funded by the National Science Foundation, among others. The organization is committed to making science research more open and available online. Unpaywall includes articles in all areas of research.