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The Grand Canyon: Facts, History & Profile

Top of Page Image Source: Getty ImagesFast Grand Canyon Facts Length: 277 miles (446 km) Width: 18 miles (29 km) at widest point Depth: 1 mile (1.6 km) deep Age: Estimated to be between 5-6…

America's Most Endangered Places 2013

The Astrodome in Houston, Texas is among American sites most at risk America's Most Endangered Places America's Most Endangered Places 2012America's Most Endangered Places 2011America's Most…

World Heritage Sites in the United States

The United Nations Educational, Scientific, and Cultural Organization (UNESCO) has identified 878 World Heritage sites that it considers of “outstanding universal value.“ In the United States…

NCAA Mens Basketball Southern Conference

ConferenceOverallNorth Div.WLPctWLPctMarshall104.714209.690Davidson104.7141810.643Appalachian St86.5711414.500Virginia Military77.5001216.429East Tennessee St212.143720.259…

bubble chamber

(Encyclopedia) bubble chamber, device for detecting charged particles and other radiation by means of tracks of bubbles left in a chamber filled with liquid hydrogen or other liquefied gas. It was…

wagon train

(Encyclopedia) wagon train, in U.S. history, a group of covered wagons used to convey people and supplies to the West before the coming of the railroad. The wagon replaced the pack, or horse, train…