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CIA - The World Factbook :: https://www.cia.gov/cia/publications/factbook/index.html

This is the online version of the World Factbook, which includes information on every country in the world - from Afghanistan to Zimbabwe, like geography, people, government, and more. There is a also map collection.

Online Conversion :: http://www.onlineconversion.com/

Converts just about any unit of measure to any other with over 5,000 units offered for conversion in areas including acceleration, angles, area, astronomy, cooking, clothing, density, energy, finance, frequency, distance, light, temperature, torque viscosity, volume and weight.