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chemistry is a branch of science that deals with chemical elements and compounds, and how they work together and change. in other words, chemistry is the branch of science about fundamental properties of matter and chemical reactions. chemistry is the study of the substances and their transformations (or change). hist...
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chemistry is a branch of science that deals with chemical elements and compounds, and how they [...] same number of atoms: 602,214,150,000,000,000,000,000 atoms. the atomic mass of an element can be used to see how much of the element makes a mole. for example, the atomic mass of copper is about 63.55. that means abou...
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computer science deals with the theoretical foundations of computation and practical techniques for their application. computer science is the science of information. computer scientists study different ways of reading, using, and encoding information. there are many different areas within computer science. in some ar...
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computer science deals with the theoretical foundations of computation and practical techniques for their [...] (looks at how to answer a question) compilers (turning words into computer programs) lexical analysis (how to turn words into data) microprogramming (how to control the most important part of a computer) ...
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a computer is a machine that uses electronics to input, process, store, and output data. data is information such as numbers, words, and lists. input of data means to read information from a keyboard, a storage device like a hard drive, or a sensor. the computer processes or changes the data by following the instructio...
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a computer is a machine that uses electronics to input, process, store, and [...]." one of the first examples of this was built by hero of alexandria (c. 10–70 ad). he built a mechanical theater which performed a play lasting 10 minutes and was operated by a complex system of ropes and drums. these ropes and drums wer...
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a computer is a machine that uses electronics to input, process, store, and [...] nd soon made them easier to program. however this is not the case as many consecutive attempts have been made to bring arithmetic logic to l3.analog computers are mechanical or electronic devices which solve problems.some are used to cont...
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a computer is a machine that uses electronics to input, process, store, and [...] imedia computers" and after the launch of the apple iphone in 2007, many are now starting to add the smartphone category among "real" computers. in 2008, if smartphones are included in the numbers of computers in the world, the biggest co...
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a computer is a machine that uses electronics to input, process, store, and [...] computer is turned off. an operating system tells the computer how to understand what jobs it has to do, how to do these jobs, and how to tell people the results. millions of computers may be using the same operating system, while each ...
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a continent is a large area of the land on earth that is joined. there are no strict rules for what land is considered a continent, but in general it is agreed there are six or seven continents in the world, including africa, antarctica, asia, europe, north america, oceania (or australasia), and south america. statis...
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The Greek classical elements are fire, air, water, and earth. In Greek philosophy, science and medicine, these make up a whole. Fire is both hot and dry. Air is both hot and wet. Water is both cold and wet. Earth is both cold and dry. The image below has two squares on top of each other. The corners of one are the cl...
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china ( pinyin: zhōngguó) is a cultural region, an ancient civilization, and a nation in east asia. the official name is people's republic of china or prc. the last chinese civil war (19271949) resulted in two different political powers today: the republic of china (roc) (since 1911), commonly known as china since 1...
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china ( pinyin: zhōngguó) is a [...] ruling dynastic house of china, is known as the warring states period. despite the bloodiness and strife of the period, this was the time when many great philosophies emerged - including confucianism and daoism as a response to disintegrating central authority of the zhou kings and...
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china ( pinyin: zhōngguó) is a [...] -shek led wars against them, and he became president and dictator. in 1931, japan invaded manchuria, a place in the northeastern part of china. on july 7, 1937, the japanese attacked the rest of the country, starting what was called the second sino-japanese war. on december 13 of ...
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china ( pinyin: zhōngguó) is a [...] the world's only socialist states openly being communist. military with 2.3 million active troops, the people's liberation army (pla) is the largest standing military force in the world. the pla is commanded by the central military commission (cmc). china has the second-biggest m...
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A country is a distinct territory with defined borders, boundaries, people and government. Most countries are sovereign states while others make up one part of a larger state Every part of the world is in a country. The people that live in a country are referred to as a nation. The government that runs the country is c...
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Colchester is a city in the northern part of the English county of Essex. It has a population of 104,000 people. People believe that Colchester is the oldest Roman town in England. History Before Roman times, Colchester was Camulodunon. This is a Celtic name that came from Camulos. Camulos was the Celtic god of war....
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Cartography is making maps. It is part of geography. How people make maps is always changing. In the past, maps were drawn by hand, but today most printed maps are made using computers and people usually see maps on computer screens. Someone who makes maps is called a cartographer. Making a map can be as simple as dra...
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A creator is a person who creates something. In some religions (Judaism, Christianity, Islam) God (or Allah meaning the God in Arabic) is the most important and original creator of the whole universe - including Man who is made "in his image" (see Genesis) to observe it and control it like God. The idea that anything ...
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Chorizo is a pork (pig-meat) sausage which people first made in the Iberian Peninsula. It is made with large pieces of fatty pork, chili pepper and paprika. The special taste of this sausage comes from the mild Spanish paprika in it. In the western hemisphere, the Mexican and Caribbean types are better known. These t...
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Creativity is the ability of a person or group to make something new and useful or valuable, or the process of making something new and useful or valuable. It happens in all areas of life - science, art, literature and music. As a personal ability it is very difficult to measure. The reason is that we don't understan...
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the cathar faith was a version of christianity. they were usually considered gnostics. the word 'cathar' comes the greek word katharos meaning 'unpolluted' (from tobias churton, the gnostics) or "the pure ones". principles the cathars believed that the world had been made by a bad god. they believed that this bad god...
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the cathar faith was a version of christianity. they were usually considered gnost [...] ensian crusade methods the pope ordered a crusade against the cathars in southern france. he said any crusader who answered the call would be given the same rewards as a crusader who went to the holy land. this was an absolution ...
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Cosmology is the branch of astronomy that deals with the origin, structure, evolution and space-time relationships of the universe. NASA defines cosmology as "The study of the structure and changes in the present universe". Another definition of cosmology is "the study of the universe, and humanity's place in it". Mod...
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a church is a building that was constructed to allow people to meet to worship together. these people are usually christians, or influenced by christianity. some other non-christian religious groups also call their religious buildings churches, most notably scientology. the following description is about roman catholi...
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a church is a building that was constructed to allow people to meet to worship together. these people are [...] often separated from the nave by a screen which can be made of wood or stone, or occasionally iron. the congregation can see through the screen. on the top of the screen there may be a cross. this is called ...
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a city is a place where many people live close together. a city has many buildings and streets. it has houses, hotels, condominiums, and apartments for many people to live in, shops where they may buy things, places for people to work, and a government to run the city and keep law and order in the city. people live in...
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a city is a place where many people live close together. a city has [...] ger and bigger. the whole area is often called a "metropolis" and can sometimes include several small ancient towns and villages. the metropolis of london includes london, westminster, and many old villages such as notting hill, southwark, rich...
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a city is a place where many people live close together. a city has [...] ities that provide much of the liberal support in them : atlanta, georgia: 5 of the 16 delegates representing georgia in the us congress are democrats. all hail from districts in atlanta. new orleans, louisiana: the only democratic delegate ...
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Cooking is a process to make food ready to eat by heating it. Raw food is food that is not cooked. Some foods are good to eat raw. Other foods are not good for the body when they are raw, so they must be cooked. Some foods are good to eat either raw or cooked. Methods Cooking is often done in a kitchen using a stove ...
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To chat is to talk about ordinary things that are not very important. A person can chat with another person, or to many people. People also use this word now for parts of the Internet where we can talk with many different people at the same time. Usually, people chat on the Internet in a chat room or messaging service ...
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A cup is any kind of container used for holding liquid and drinking. These include: teacup paper cup Cup may also mean: Measuring cup, a measuring instrument for liquids and powders, used primarily in cooking Cup (unit), a customary unit of volume and measure Cancer of unknown primary origin, form of cancer The cup ...
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a crime (or misdemeanor or felony) is an act done by a person which is against the laws of a country or region. a person who does this is called a criminal. the basic idea of what things are called "crimes" is that they are thought to be things that might cause a problem for another person. things like killing another...
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Time Cube was a personal website created on 1997 by Otis Eugene Ray. On that website, Ray explained his theory of everything, known as "Time Cube". It described the planet Earth as having a cubic symmetry, and time as rotating four "corners". He also said that all of modern physics is wrong. Scientists reject these ide...
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The Census of Marine Life was a ten-year survey of life in the oceans, starting in 2000. Its head was Ron O'Dor of Dalhousie University in Halifax, Nova Scotia, Canada. It used data from researchers all over the world. More than 70 nations were involved and over a billion US dollars were spent on it. It was a major wo...
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Maize or Indian corn (called corn in some countries) is Zea mays, a member of the grass family Poaceae. It is a cereal grain which was first grown by people in ancient Central America. Approximately 1 billion tonnes are harvested every year. However, little of this maize is eaten directly by humans. Most is used to mak...
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Civics is the study of government. It most often refers to studying government in high school to prepare to be a good citizen. In college, civics is usually called political science. Since a city has the most unsimple government problems, the word for this study is like that for city. Theories of civics can be grouped...
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calculus is a branch of mathematics that describes continuous change. there are two different types of calculus. differential calculus divides (differentiates) things into small (different) pieces, and tells us how they change from one moment to the next, while integral calculus joins (integrates) the small pieces tog...
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calculus is a branch of mathematics that describes continuous change. there are two different [...] it goes up or down (y or vertical) divided by how much it goes across (x or horizontal). on a curve, however, the slope is a variable (has different values at different points) because the line bends. but if the curve...
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A coin is a piece of metal that is used as currency, or money. The earliest coins were in Lydia, in what is Turkey today, in 7th Century BC. They were made from electrum, an alloy found in riverbeds. Most people use coins as currency. They usually have lower value than banknotes. Most are made in government mints. A...
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A conceptual metaphor or cognitive metaphor is a metaphor which refers to one domain (group of ideas) in terms of another. For example, treating quantity in terms of direction: Prices are rising. I attacked every weak point in his argument. (Argument as war rather than enquiry or search for truth). Life is a journey. L...
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Crust is a piece of bread where the edge where it is harder and darker. Crust can also mean: Crust (geology) - the outer solid layer of a planet such as the Earth but other planets also. On Earth the crust can be divided into: continental crust on which the land of the planet Earth sits oceanic crust which forms mos...
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comedy (from ), in modern times, is an entertainment with generally funny content. it is able to make people laugh. this definition was used for theatre plays, and was first used in ancient greece. aristotle defined this as "comedy is, as an imitation of characters of a lower type- not, however, in the full sense of th...
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A comet is a ball of mostly ice that moves around in outer space. Comets are often described as "dirty snowballs". They are very different from asteroids. The orbital inclinations of comets are usually high and not near the ecliptic where most solar system objects are found. Most of them are long-period comets and come...
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Cytology is the study of the cells, especially their appearance and structure. Cells are the small parts that make up all living things, and their effects on each other and their environment. There are two types of cells. Prokaryotic cells do not have a clear and easy-to-see nucleus, and do not have a membrane, or wal...
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A Christian is a person who believes in Christianity, a monotheistic religion. Christianity is mostly about the life and teachings of Jesus Christ, in the New Testament and interpreted or prophesied in the Hebrew Bible/Old Testament. Christianity is the world's largest religion, with 2.1 billion followers around the wo...
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Origin People have been making cheese since before history was written down. It is not known when cheese was first made. It is known that cheese was eaten by the Sumerians in about 4000 BC. Classification There are many different ways to classify cheeses. Some ways include: How long the cheese was aged The tex...
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The constitution of a country (or a state) is a special type of law document that tells how its government is supposed to work. It tells how the country's leaders are to be chosen and how long they get to stay in office, how new laws are made and old laws are to be changed or removed based on law, what kind of people a...
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A circle, also known as a nought, is a round, two-dimensional shape. All points on the edge of the circle are at the same distance from the center. The radius of a circle is a line from the center of the circle to a point on the side. Mathematicians use the letter for the length of a circle's radius. The center of a c...
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Capitalization (North American spelling), or capitalisation (British spelling), is a process to make one letter or more uppercase. The first letter of a sentence is capitalised in many languages, as are the first letters of proper nouns such as names of people and places. In German, however, all nouns are capitalized.....
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cuba is an island country in the caribbean sea. the country is made up of the big island of cuba, the isla de la juventud island (isle of youth), and many smaller islands. havana is the capital city of cuba. it is the largest city. the second largest city is santiago de cuba. in spanish, the capital is called "la haban...
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cuba is an island country in the caribbean sea. the country is made [...] the americans still had a big say in cuban politics. americans owned most of cuba's businesses. the americans supported the leader fulgencio batista, who was seen by many cubans as corrupt. in addition to political control, the united states al...
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cuba is an island country in the caribbean sea. the country is made [...] est-serving heads of state. in 2018, miguel díaz-canel became the official president of cuba. in april 2015, historic talks took place with us president obama and cuban general secretary raúl castro in improving relations between the two nations...
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cuba is an island country in the caribbean sea. the country is made [...]. in some aspects, however, like education, health care and life expectancy it ranks much better than most countries in latin america. its infant death rate is lower than some developed countries. the average life expectancy is 78 years. all the ...
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A cube is a type of polyhedron with all right angles and whose height, width and depth are all the same. It is a type of rectangular prism, which is itself a type of hexahedron. A cube is one of the simplest mathematical shapes in space. Something that is shaped like a cube can be called cubic. Surface area of cube=6l...
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december (dec.) is the twelfth and last month of the year in the gregorian calendar, coming between november (of the current year) and january (of the following year). it has 31 days. with the name of the month coming from the latin decem for "ten", it was the tenth month of the year before january and february were ad...
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december (dec.) is the twelfth and last month of the year [...] ence (portugal) december 1 - first day of summer (australia) december 2 - national day of laos december 2 - national day of the united arab emirates december 2 - international day for the abolition of slavery december 4 - navy day in india and italy ...
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december (dec.) is the twelfth and last month of the year [...] and calennig in wales moveable and non-single day events hanukkah (judaism) - celebrated over a period of eight days advent in western christianity first sunday in advent occurs between november 27 and december 3 second sunday in advent occurs betwee...
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december (dec.) is the twelfth and last month of the year [...] the people's republic of china. december 21, 1898 - marie and pierre curie announce their discovery of radium. december 21, 1913 - the first crossword puzzle is published. december 21, 1988 - a terrorist bomb explodes on pan am flight 103 over lockerbi...
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Dublin is the capital of the Republic of Ireland, and the biggest city on the island of Ireland. In 2011, there were over 1.1 million people living in the Greater Dublin Area. Dublin was built by the Vikings upon the river Liffey. The river divides the city into two parts, North Dublin and South Dublin. Many famous w...
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dance is a performing art. it is described in many ways. it is when people move to a musical rhythm, like a drum beat. they may be alone, or in a group. the dance may be an informal play, a part of a ritual, or a part of a professional performance. there are many kinds of dances, and every human society has its own dan...
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dance is a performing art. it is described in many ways. it is when people move [...] ance as individuals, separately, as they please. street dance is like that. all these types of dance have music. at the same time, round the world there are many traditional dances. some of them have been going for hundreds of years....
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The dissolution of the monasteries was an event that happened from 1536 to 1540, when English King Henry VIII took away the land and money that the nuns and monks of the Roman Catholic church owned. Henry VIII then gave this land and money to people that supported him. This was also when Henry VIII made himself the ne...
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A deadline is a time by which some task must be completed. Very often, it means a time limit that is set in place by an authority - for example, a teacher tells students that they must turn in their homework in by a certain time. This is so the teacher is able to report fairly to his or her principal that every studen...
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Dutton Speedwords is a made-up language written by Reginald John Garfield Dutton. The idea of Dutton Speedwords is to make frequent words short, and very frequent words very short. Dutton Speedwords can be used as a second language for international communications. Dutton Speedwords is also a shorthand writing system –...
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in some religions and mythology, the devil is an evil spirit, demon or supernatural being that tries to create problems for people and distance them from god. in some cultures, the devil seen as the embodiment of evil. he is characterised by his red skin, horns and tail. some people also use the words "the devil" or "...
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diarrhea (die-uh-ree-uh), also spelled diarrhoea, happens when the body makes more watery feces than normal. diarrhea can occur in humans as well as most other mammals. causes diarrhea is not a disease. but it may be a symptom of a disease. the most common causes of diarrhea are: viruses, like norovirus (the most co...
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Dimensions are the way we see, measure and experience our world, by using up and down, right to left, back to front, hot and cold, how heavy and how long, as well as more advanced concepts from mathematics and physics. One way to define a dimension is to look at the degrees of freedom, or the way an object can move in ...
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Distance is how far one thing is from another thing. It is also a measure of the space between two things. It can be measured along any path. Thus, someone who goes around in a circle has traveled a distance, even though his position has not changed. In geometry, the distance between two points A and B is sometimes wr...
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In math, the distance between the nearest end and the farthest end of an object is its depth. For example, you can measure the depth of a box. When you find the distance between one end of the box and another end of the box, you measure the box's depth. Depth in Liquids For liquids, the distance between the top or ...
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A dictionary is a type of book which explains the meanings of words or, more precisely, lexemes. The words are arranged in alphabetical order so that they can be found quickly. The word "dictionary" comes from the Latin "dictio" ("saying"). There are several types of dictionaries: dictionaries which explain words and ...
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A definition in language explains what a word or phrase means. A definition usually answers the question what is.... Defining means giving a definition. Other words with this meaning are description and explanation. It describes what a word means and explains to the person when and where it can be used. In mathemati...
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denmark, officially named the kingdom of denmark, is a nordic country in northern europe. it is the furthest south of the scandinavian countries, to the south of norway and south-west of sweden (which it is connected to by a bridge). it has a south border with germany. it borders both the north sea to the west and the ...
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denmark, officially named the kingdom of denmark, is a nordic country [...] the south), sweden (to the east), norway (to the north) and the united kingdom (to the west). the country is surrounded by the sea except for jutland (jylland), the largest part of denmark. it is connected to germany by land. to the south-east...
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denmark, officially named the kingdom of denmark, is a nordic country [...], a left-wing party which is "social democratic" (slightly socialist). venstre, liberal party of denmark (danish: venstre (meaning "left")), a liberal party. danish social liberal party (danish: det radikale venstre), a radical left/borderline...
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denmark, officially named the kingdom of denmark, is a nordic country [...] baltic sea to germany, but it will most likely be built in a few years. the bridge to sweden was expensive, took a long time to build, and required much planning by engineers. there are still many islands with no bridges to the mainland. peop...
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denmark, officially named the kingdom of denmark, is a nordic country [...] -week summer holiday in july or august. sports the most popular sport in denmark is football (soccer). sailing, swimming and other water sports are very popular because of the long coastline. another common sport is cycling, (copenhagen has b...
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death is the end of a life in an organism. all biological and living activity of the living thing stop, including the mind and the senses. the usual signal for death in humans and many other animals is that the heart stops beating and cannot be restarted. this can be caused by many things. all living things have a limi...
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death is the end of a life in an organism. all biological and living activity of [...] in islam this is thought to demonstrate the injustice of human systems of dealing out death, and the ability of the best people to overcome it and even forgive it. in christianity itself it is thought to prove that jesus himself was...
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A diesel-electric engine is a diesel generator, a diesel engine that drives an electric generator. The generator feeds electric power to an electric motor which turns a driveshaft. Its efficiency is higher than when an engine drives a shaft through gears. Most locomotives and many ships use diesel-electric drive. Many...
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A foreign embassy is the official office of one country in another. It is usually in the capital city of the other country. It is where the [[ambassador]relationship between the two countries. The head of the embassy is usually an ambassador, but can also be a minister, high commissioner, or other level of diplomatic...
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europe is the western part of the continent of eurasia, often thought of as its own continent. it is separated from asia by the ural mountains in russia and the bosporus strait in turkey. europe is bordered by water on three sides. on the west is the atlantic ocean. to the north is the arctic ocean. the mediterranean ...
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An encyclopedia (also known in English as an encyclopædia) is a collection (usually a book or website) of information. Some are called "encyclopedic dictionaries". All encyclopedias were printed, until the late 20th century when some were on CDs and the Internet. 21st century encyclopedias are mostly online by Intern...
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Earth science is an all-embracing term for the sciences related to the planet Earth. Earth science may also be called geoscience. Geoscience is the study of the architecture of the earth. It is a broader term than geology because it includes aspects of planetary science, which is part of astronomy. The Earth sciences ...
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earth is the third planet from the sun in the solar system. it is the only planet known to have life on it. the earth formed about 4.5 billion years ago. it is one of four rocky planets on the inner side of the solar system. the other three are mercury, venus, and mars. the large mass of the sun keeps the earth in orb...
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earth is the third planet from the sun in the solar system. it is the only [...] and climate has been very different in the past. about 3 to 3.5 billion years ago almost all land was in one place. this is called a supercontinent. the earliest known supercontinent was called vaalbara. much later, there was a time (the ...
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earth is the third planet from the sun in the solar system. it is the only [...] able to see how quickly the shock waves move through earth in different places. the inside of earth is very different from the outside. almost all of earth's liquid water is in the seas or close to the surface. the surface also has a lot...
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earth is the third planet from the sun in the solar system. it is the only [...] the earth stops the water from going away into outer space. also, much of the land on earth is covered with plants, or with what is left from earlier living things. places with very little rain are dry wastes called deserts. deserts usuall...
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earth is the third planet from the sun in the solar system. it is the only [...] dioxide and can cause more warming. a discussion is going on now about what people should do about the earth's latest warming, which has gone on for about 150 years. so far, this warming has been acceptable: plants have grown better. the ...
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Et cetera means "and the rest" in Latin. It is often used in English to continue a list that is longer than what can be normally written. People most often write "et cetera" as etc.. Very rarely, it is also written "&c" because the ampersand, or the "&", is the same as "et", having been formed by 'e' and 't' being join...
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An experiment is a test of an idea or a method. It is often used by scientists and engineers. An experiment is used to see how well the idea matches the real world. Experiments have been used for many years to help people understand the world around them. Experiments are part of scientific method. Many experiments are ...
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Ethics is the study of good and bad behavior. It is one of the main parts of philosophy. Ethics tries to answer questions like: What actions are good? What actions are evil? How can we tell the difference? Are good and evil the same? How should we make hard decisions that might help or hurt other people? How do o...
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E Prime (it means English Prime) defines a way of speaking English without using the verb "to be" in any way ("be, is, am, are, was, were, been, and being"). Instead, an E Prime speaker or writer uses different verbs like "to become," "to remain," and "to equal" or they might choose to rearrange the sentence to show th...
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Einstein on the Beach is an opera written by the minimalist composer Philip Glass and theater director and designer Robert Wilson. It was first acted for an audience in Avignon, France in 1976. It is a single act opera, about five hours long with no intermission. Because of the length and the minimalist (repetitive) ...
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Were you looking for the English Wikipedia, the full English Wikipedia version of Simple? The word English can mean: From or about the country England English people English language The Amish word for somebody who is not in their group Avoirdupois, a system of measurement sometimes called "English". English open...
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An ethnic group is a group of people who are considered to be the same in some or multiple ways. They may all have the same ancestors, speak the same language, or have the same culture, which could sometimes include religion. They often live in the same or surrounding area. Sometimes almost all of the people in one co...
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ebola virus or ebola virus disease (evd), often shortened to ebola, is a very dangerous virus. it belongs to the family filoviridae. four different types of ebola virus can cause a severe disease which is often fatal. ebola infection causes hemorrhagic fever which starts suddenly. "hemorrhagic" means that the victim wi...
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ecology is the branch of biology that studies the biota (living things), the environment, and their interactions. it comes from the greek oikos = house; logos = study. ecology is the study of ecosystems. ecosystems describe the web or network of relations among organisms at different scales of organization. since eco...
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economics is the social science which studies economic activity: how people make choices to get what they want. it has been defined as "the study of scarcity and choice" and is basically about the choices people make. it also studies what affects the production, distribution and consumption of goods and services in an ...
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economics is the social science which studies economic activity: how people make choices to get what they [...] wealth physiocracy classical economics marxist economics austrian economics neoclassical economics welfare economics the ideas that economists have depend a lot on the times they live in. for example,...
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