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 North America is a continent in the Earth's northern hemisphere and western hemisphere. It is bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the southeast by the Caribbean Sea, and on the south and west by the North Pacific Ocean; South America lies to the southeast. It covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 4.8% of the planet's surface or about 16.5% of its land area. As of July 2008, its population was estimated at nearly 529 million people. It is the third-largest continent in area, following Asia and Africa, and the fourth in population after Asia, Africa, and Europe. North America and South America are collectively known as the Americas or simply America.  North and South America are generally accepted as having been named after the Italian explorer Amerigo Vespucci, who explored South America between 1497 and 1502, and was the first European to suggest that the Americas were not the East Indies. Scientists have several theories as to the origins of the early human population of North America. The indigenous peoples of North America themselves have many creation myths, by which they assert that they have been present on the land since its creation. Before contact with Europeans, the natives of North America were divided into many different polities, from small bands of a few families to large empires. They lived in several "culture areas", which roughly correspond to geographic and biological zones and give a good indication of the main lifeway or occupation of the people who lived there.  Created in 1967, the three-tiered order was established as a fellowship that recognizes the achievement of outstanding merit or distinguished service by Canadians, through life-long contributions in every field of endeavour, and who made a major difference to Canada, as well as the efforts made by non-Canadians who have made the world better by their actions. The Canadian monarch, at present Elizabeth II, is Sovereign of the order, and the serving Governor General, Michaëlle Jean, is its Chancellor and Principal Companion. Appointees into the order are selected by an advisory board and formally inducted by the Governor General; as of April 2008, 5,479 people have been appointed to the Order of Canada, including musicians, politicians, artists, athletes, television and film stars, benefactors, and others. 
 In philosophy of mind, Putnam is known for his argument against the type-identity of mental and physical states based on his hypothesis of the multiple realizability of the mental, and for the concept of functionalism, an influential theory regarding the mind-body problem. In philosophy of language, along with Saul Kripke and others, he developed the causal theory of reference, and formulated an original theory of meaning, inventing the notion of semantic externalism based on a famous thought experiment called Twin Earth. Wikinews North America portal
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