Explains the composition of natural gas and what is required to make it market-ready, types of reservoirs, and what happens in a natural gas processing plant. Includes a diagram showing the whole process. (Published: September 12, 2011)

Article describes the different types of symbiosis, some of which are of mutual benefit, and others not. It also explains the differences between endosymbiosis and exosymbiosis, where one organism lives either inside or else upon the...

Information about the metallic element, Molybdenum, atomic number 42. It is unique in having an extremely high melting point. Covers its discovery, its biological importance, its physical and atomic properties, how abundant it is on the...

Information about the Mojave Desert: ways it differs from other deserts, its conservation status, and efforts to protect it. (Published: April 30, 2010)

Article explaining what methane is, its impact as a greenhouse gas on global warming, and natural and man-made sources of methane. (Published: April 30, 2010)

Information about the synthetic, radioactive element, Mendelevium, atomic number 101. Covers its discovery, physical and atomic properties, and details about permissible exposure.

Defines inertial and gravitational mass, their scientific history, formulas used in their calculation, the definition of weight, units used for mass, and mass as perceived in the theory of special relativity.

Extensive article on mangroves. Covers classification, physical characteristics, life cycle, habitat, economic value, and natural and human threats to their survival.

A biography of the scientist Marie Curie (1867-1934). With links to additional information.

Information about the element, Manganese, atomic number 25. Covers physical properties, atomic properties, how abundant it is on the Earth, details about health-related regulations, and its importance to human health. Also discusses...

Article explaining the basic characteristics of mammals, their diet, reproduction, behavior, conservation concerns, taxonomy, and their evolution. (Published: September 23, 2010)

Learn about the career of the first famous cowgirl, Lucille Mulhall of Oklahoma.

This biography describes the life of Bass Reeves, who fled slavery and became a United States marshall.

This brief biography discusses the life of American pioneer Jesse Chisholm, who blazed the Chisholm Trail.

Learn about the early life and aviation career of Wiley Post, who set a world record for flying around the planet.

As part of the Works Progress Administration, the Federal Art Project's goal was to provide employment to artists who would be educators and creators of public art. Read about the legacy of the Federal Art Project in Oklahoma during the...

Illustrated biographical profile of Alabama native Jesse Owens.

This article from the Encyclopedia of Chicago explains how a strike by railroad workers in West Virginia eventually made its way to Chicago and was taken up by workers from many industries. See how city officials resolved this general...

The Encyclopedia of Life presents this in-depth overview of Virginia Opossums (Didelphis virginiana), including their habitats, size, conservation status, and much more. Images of this species and maps of its global distribution can also...

The Encyclopedia of Life presents this in-depth overview of Honey Badgers (Mellivora capensis), including their habitats, size, conservation status, and much more. Images of this species and maps of its global distribution can also be...

The Encyclopedia of Life presents this in-depth overview of Common Wasps (Vespula vulgaris), including their habitats, size, conservation status, and much more. Images of this species and maps of its global distribution can also be found...

This entry from Encyclopedia Britannica features Nat Turner, a black American slave who led the only effective, sustained slave rebellion (August 1831) in U.S. history. Spreading terror throughout the white South, his action set off a...

This entry from Encyclopedia Britannica features Paule Marshall, a novelist whose works emphasize the need for black Americans to reclaim their African heritage.

This entry from Encyclopedia Britannica features Pearl Primus, an American dancer, choreographer, anthropologist, and teacher whose performance work drew on the African American experience and on her research in Africa and the Caribbean.