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Forms of Address

The Question: How does one abbreviate the rank of Captain (U.S. Navy) in correspondence? The Answer: When corresponding with a captain in the U.S. Navy, the…

Frequently Asked Questions

Fact Monster is a kids' reference website brought to you by the editors at Information Please. The editors have compiled this page of frequently asked questions to help you better understand how to…

Theories of the Universe: Action at a Distance

Action at a DistanceTheories of the UniverseThe Universe As a HologramAction at a DistanceQuantum PotentialThe Importance of WholenessOrdered RealityThe Holographic Universe This astounding bit of…

Most Populous Cities of the World

The biggest cities to ever exist For the first time in human history, a majority of people live in urban environments. The world's largest cities today fall under a class that researchers call "…

Astronomical Terms

The Milky Way, the galaxy containing our solar system, is about 100,000 light-years in diameter and about 10,000 light-years thick. Aphelion: see Orbit. Apogee: see Orbit. Black hole: the…

January 2009 Current Events

Here are the key news events of the month organized into three categories: World News, U.S. News, and Business, Society, and Science News. World | Nation | Business/…

The World's Most-Visited Tourist Attractions

Think the Empire State Building, Grand Canyon and the Eifel Tower are the most-visited tourist attractions in the world? Think again. by Jennie Wood Grand Central Station, New York…

In a Nutshell: The Theory of Relativity

You’ve probably heard of the theory of relativity. And you may even know that motion, mass, energy, time and space are all relative. But if you’re confused about what any of that actually means, look…

Selected Biographies: H

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z More Biographies Don't see the biography you're looking for? Search 30,000+ biographies Biographies…