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U.S. Cities
U.S. Cities

Tour the major cities of the U.S. and find facts, stats, and the history of the country’s metropolitan areas.

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Blue Moon
Although the full moon on July 31, 2015, will look like an ordinary full moon, it's actually a bit extraordinary—a blue moon. Read about this rare phenomenon.
Endangered and Threatened Species
A dentist from Minnesota created an international uproar after killing a prized African lion. Find a list of plants and animals that are in danger of being lost.
Highest-Grossing Concert Tours
Bands that debuted decades ago dominate the list, with U2's 360° Tour in the No. 1 spot. See which other classic rockers round out the top ten.
Taliban Timeline
Afghanistan's intelligence agency announced that the founder and leader of the Taliban died in 2013 in Pakistan. Take a look at other key events in the history of this insurgent group.

Have Your Say

When I go to the beach I am most afraid of...

  • Pick choice 1 being stung by a jellyfish.
  • Pick choice 2 being attacked by a shark.
  • Pick choice 3 getting sunburned.
  • Pick choice 4 being pulled underwater by an undertow.

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

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

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


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