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

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

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

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

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

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

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

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

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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.

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

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

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Despite the fact that lemurs are general nocturnal, the ring-tailed lemur travels by day in bands of four to twelve individuals.

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The Western world is beset with the range of problem that characterize mature, post-industrial societies.

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Acrylic paints are either applied using a knife or diluted and spreading with a paintbrush.

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Some marine invertebrates, such as the sea urchin and the starfish, migrates from deep water to shallow during spring and early summer to spawn.

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Marshes, wetland areas characterized by plant grassy growth, are distinguished from swamps, wetlands where trees grown.

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Wampum, beads used as a form of exchange by some Native Americans, was made of bits of seashells cut, drill, and strung into belts.

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Kangaroos use their long and powerful tails for balance themselves when sitting upright or jumping.

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Proper city planning provides for the distribution of public utilities, public buildings, parks, and recreation centers, and for adequate and the inexpensive housing.

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Most traditional dances are made up of a prearranged series of steps and movements, but modern dancers are generally free to move as they choice.