The fact that white light is light composed of various wavelengths may be demonstrating by dispersing a beam of such light through a prism.

In the United States during the Second World War, each trade unions and employers avoided federal limits on wages by offering employees nontaxable medical benefits.

Philosophy is the study of the nature of reality, knowledge, existent, and ethics by means of rational inquiry.

Poems vary in length from brief lyric poems to narrative or epic poems, which can be as broad in scope than a novel.

The population of California more than doubled during the period 1940-1960, creating problems in oad-building and provide water for its arid southern section.

Although based it on feudal models, the colony of Pennsylvania developed a reputation for a progressive political and social outlook.

Hard and resistant to corrosion, bronze is traditionally used in bell casting and is the material used widely most for metal sculpture.

The Appalachian Mountains formation a natural barrier between the eastern seaboard and the vast owlands of the continental interior of North America.

The United States census for 1970 showed that the French-speaking residents of Louisiana were one of the country’s most compact regional linguistic minority.

When used as food additives, antioxidants prevent fats and oils from become rancid when exposed to air, and thus extend their shelf life.

Copper was the first metallic used by humans and is second only to iron in its utility through the ages.