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World Fact Book
Gapminder
NBC Learn
Explore the engineering and technology helping athletes maximize their performance at the 2012 London Games.
Gapminder shows the world's most important trends.
The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.
Berkeley Earth
Analysis of land-surface temperature records going back 250 years.