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Portal:North America

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North America is a continent in the Northern and Western Hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. The region includes the Bahamas, Bermuda, Canada, the Caribbean, Central America, Clipperton Island, Greenland, Mexico, Saint Pierre and Miquelon, Turks and Caicos Islands, and the United States.

North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), representing approximately 16.5% of the Earth's land area and 4.8% of its total surface area. It is the third-largest continent by size after Asia and Africa, and the fourth-largest continent by population after Asia, Africa, and Europe. , North America's population was estimated as over 592 million people in 23 independent states, or about 7.5% of the world's population. In human geography, the terms "North America" and "North American" sometimes refer to just Canada, the United States, Mexico, and Greenland.

It is unknown with certainty how and when first human populations first reached North America. People were known to live in the Americas at least 20,000 years ago, but various evidence points to possibly earlier dates. The Paleo-Indian period in North America followed the Last Glacial Period, and lasted until about 10,000 years ago when the Archaic period began. The classic stage followed the Archaic period, and lasted from approximately the 6th to 13th centuries. Beginning in 1000 AD, the Norse were the first Europeans to begin exploring and ultimately colonizing areas of North America.

In 1492, the exploratory voyages of Christopher Columbus led to a transatlantic exchange, including migrations of European settlers during the Age of Discovery and the early modern period. Present-day cultural and ethnic patterns reflect interactions between European colonists, indigenous peoples, enslaved Africans, immigrants from Europe, Asia, and descendants of these respective groups. (Full article...)

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Location of Mayan speaking populations. See below for a detailed map of the different languages.[image reference needed]

The Mayan languages form a language family spoken in Mesoamerica, both in the south of Mexico and northern Central America. Mayan languages are spoken by at least six million Maya people, primarily in Guatemala, Mexico, Belize, El Salvador and Honduras. In 1996, Guatemala formally recognized 21 Mayan languages by name, and Mexico recognizes eight within its territory.

The Mayan language family is one of the best-documented and most studied in the Americas. Modern Mayan languages descend from the Proto-Mayan language, thought to have been spoken at least 5,000 years ago; it has been partially reconstructed using the comparative method. The proto-Mayan language diversified into at least six different branches: the Huastecan, Quichean, Yucatecan, Qanjobalan, Mamean and Chʼolan–Tzeltalan branches. (Full article...)
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El Caracol
El Caracol
Credit: Eric Baetscher
El Caracol at the Mayan archaeological site Chichen Itza in Yucatán, Mexico, is believed to have been an observatory with doors and windows aligned to view astronomical events sacred to the feathered-serpent god Kukulkan, specifically around the path of Venus as it traverses the sky.

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Putnam in 2006

Hilary Whitehall Putnam (/ˈpʌtnəm/; July 31, 1926 – March 13, 2016) was an American philosopher, mathematician, computer scientist, and figure in analytic philosophy in the second half of the 20th century. He contributed to the studies of philosophy of mind, philosophy of language, philosophy of mathematics, and philosophy of science. Outside philosophy, Putnam contributed to mathematics and computer science. Together with Martin Davis he developed the Davis–Putnam algorithm for the Boolean satisfiability problem and he helped demonstrate the unsolvability of Hilbert's tenth problem.

Putnam applied equal scrutiny to his own philosophical positions as to those of others, subjecting each position to rigorous analysis until he exposed its flaws. As a result, he acquired a reputation for frequently changing his positions. In philosophy of mind, Putnam argued 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, introducing the notion of semantic externalism based on a thought experiment called Twin Earth. (Full article...)

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A pyramid on the 5th terrace of the Acropolis at Toniná.

Tonina (or Toniná in Spanish orthography) is a pre-Columbian archaeological site and ruined city of the Maya civilization located in what is now the Mexican state of Chiapas, some 13 km (8.1 mi) east of the town of Ocosingo.

The site is medium to large, with groups of temple-pyramids set on terraces rising some 71 metres (233 ft) above a plaza, a large court for playing the Mesoamerican ballgame, and over 100 carved monuments, most dating from the 6th century through the 9th centuries AD, during the Classic period. Toniná is distinguished by its well preserved stucco sculptures and particularly by its in-the-round carved monuments, produced to an extent not seen in Mesoamerica since the end of the much earlier Olmec civilization. Toniná possesses one of the largest pyramids in Mexico; at 74 metres (243 ft) in height, it is taller than the Pyramid of the Sun at Teotihuacan. (Full article...)
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  • ... that the Chontal Maya of Tabasco consider themselves the direct descendants of the Olmec civilization?

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Air pollution over the City of Los Angeles
Air pollution over the City of Los Angeles
Credit: Diliff
Los Angeles is the second-largest city in the United States, with an estimated population of 3.85 million people. Los Angeles is one of the cultural, economic, scientific and entertainment centers of the country.

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