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U.S. Cities

Learn about the history and culture of major U.S. cities and find facts and stats about them.

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A Look Back at the Chernobyl Disaster
Read about the worst nuclear disaster in history, which occurred on April 26, 1986.

Largest Nuclear Power Plants in the U.S.
The three largest plants are in Arizona. See where the others are located.

Hydraulic Fracturing—Fracking
Does scientific research back up the bad rap fracking has received?

U.S. Energy Consumption
The U.S. consumes more fossil fuels than any other energy source. See the breakdown.

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An atlas featuring maps and detailed profiles of all 193 countries and the 50 U.S. states.

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An unabridged dictionary from aalii to zymurgy, including a pronunciation guide.

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A current and comprehensive encyclopedia covering all the major branches of knowledge from astrophysics to Zimbabwe.

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