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internet
The Internet is a worldwide, publicly accessible network of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP). It is a "network of networks" that consists of millions of smaller domestic, academic, business, and government networks, which together carry various information and services, such as electronic mail, online chat, file transfer, and the interlinked web pages and other documents of the world wide web.
The USSR's launch of Sputnik spurred the United States to create the Advanced Research Projects Agency, known as ARPA, in February 1958 to regain a technological lead.[1][2] ARPA created the Information Processing Technology Office (IPTO) to further the research of the Semi Automatic Ground Environment (SAGE) program, which had networked country-wide radar systems together for the first time. J. C. R. Licklider was selected to head the IPTO, and saw universal networking as a potential unifying human revolution.
Licklider had moved from the Psycho-Acoustic Laboratory at Harvard University to MIT in 1950, after becoming interested in information technology. At MIT, he served on a committee that established Lincoln Laboratory and worked on the SAGE project. In 1957 he became a Vice President at BBN, where he bought the first production PDP-1 computer and conducted the first public demonstration of time-sharing.
At the IPTO, Licklider recruited Lawrence Roberts to head a project to implement a network, and Roberts based the technology on the work of Paul Baran who had written an exhaustive study for the U.S. Air Force that recommended packet switching (as opposed to circuit switching) to make a network highly robust and survivable. After much work, the first node went live at UCLA on October 29, 1969 on what would be called the ARPANET, one of the "eve" networks of today's Internet. Following on from this, the British Post Office, Western Union International and Tymnet collaborated to create the first international packet switched network, referred to as the International Packet Switched Service (IPSS), in 1978. This network grew from Europe and the US to cover Canada, Hong Kong and Australia by 1981.
The first TCP/IP-wide area network was operational by January 1, 1983, when the United States' National Science Foundation (NSF) constructed a university network backbone that would later become the NSFNet.
It was then followed by the opening of the network to commercial interests in 1985. Important, separate networks that offered gateways into, then later merged with, the NSFNet include Usenet, BITNET and the various commercial and educational networks, such as X.25, Compuserve and JANET. Telenet (later called Sprintnet) was a large privately-funded national computer network with free dial-up access in cities throughout the U.S. that had been in operation since the 1970s. This network eventually merged with the others in the 1990s as the TCP/IP protocol became increasingly popular. The ability of TCP/IP to work over these pre-existing communication networks, especially the international X.25 IPSS network, allowed for a great ease of growth. Use of the term "Internet" to describe a single global TCP/IP network originated around this time.
languages
A language is a system used to facilitate communication among higher animals and/or computers. This article is about the fundamental features typically found in nearly all natural human languages. For information about artificial languages specifically for computers, please see instead machine code. Higher animals believed to employ audible language only, without symbols, include, but are not limited to, dolphins and whales. For information about this subject, please see "Animal communication" instead.
International Auxiliary Languages :
Some languages are meant specifically for communication between people of different nationalities or language groups. Several of these languages have been constructed by an individual or group, as noted below. Others are seen as natural, pre-existing languages. Their developers merely catalogued and standardized their vocabulary and identified their grammatical rules. These languages are called naturalistic. One such language, Latino Sine Flexione, is a simplified form of Latin. Another, Occidental, was drawn from several Western languages.
To date, the most successful naturalistic language is Interlingua. The vocabulary of Interlingua consists of international words from any language family. Most Interlingua words are of Greco-Latin origin, because Greek and Latin have penetrated very widely into modern-day languages. Interlingua makes use of Spanish, Portuguese, Italian, French, English, German, and Russian as control languages to confirm the internationality of each eligible word. The International Auxiliary Language Association, which standardized Interlingua, found that this selection of controls gave Interlingua the greatest possible internationality.
Language is an element of culture that contributes to every aspect of human relationships. Andy Clark’s assertion that language is the ultimate cultural artifact is backed by the countless functions that language serves. The role that language plays in human interaction transcends basic communication (such as commanding somebody to do something, or providing information when asked a question) to facilitate the existence of ethos and mythos. This cultural artifact encodes meanings through its ability to manipulate what others imagine. The existence of denotations, what we mean to point out or say, is often received as connotation, what people have culturally subscribed to understanding when something is pointed out. Because of language’s proficiency to encode an extensive range of meanings, and represent almost all ideas including thoughts, it is the ultimate cultural artifact.
pollution
Pollution is the introduction of substances or energy into the environment, resulting in deleterious effects of such a nature as to endanger human health, harm living resources and ecosystems, and impair or interfere with amenities and other legitimate uses of the environment.[1] The major forms of pollution include:
Air pollution, the release of chemicals and particulates into the atmosphere. Common examples include carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs), and nitrogen oxides produced by industry and motor vehicles. Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight.
Water pollution via surface runoff and leaching to groundwater.
Soil contamination occurs when chemicals are released by spill or underground storage tank leakage. Among the most significant soil contaminants are hydrocarbons, heavy metals, MTBE[2], herbicides, pesticides and chlorinated hydrocarbons.
Radioactive contamination, added in the wake of 20th-century discoveries in atomic physics. (See alpha emitters and actinides in the environment.)
Noise pollution, which encompasses roadway noise, aircraft noise, industrial noise as well as high-intensity sonar.
Light pollution, includes light trespass, over-illumination and astronomical interference.
Visual pollution, which can refer to the presence of overhead power lines, motorway billboards, scarred landforms (as from strip mining), open storage of trash or municipal solid waste.
Thermal Pollution, is a temperature change in natural water bodies caused by human influence.
Sulfur dioxide and oxides of nitrogen can cause acid rain which reduces the pH value of soil.
Soil can become infertile and unsuitable for plants. This will affect other organisms in the food web.
Smog and haze can reduce the amount of sunlight received by plants to carry out photosynthesis.
Invasive species can out compete native species and reduce biodiversity. Invasive plants can contribute debris and biomolecules (allelopathy) that can alter soil and chemical compositions of an environment, often reducing native species competitiveness.
To protect the environment from the adverse effects of pollution, many nations worldwide have enacted legislation to regulate various types of pollution as well as to mitigate the adverse effects of pollution.
Sources and causes :
Motor vehicle emissions are one of the leading causes of air pollution.[3][4][5] China, United States, Russia, Mexico, and Japan are the world leaders in air pollution emissions; however, Canada is the number two country, ranked per capita. Principal stationary pollution sources include chemical plants, coal-fired power plants, oil refineries,[6] petrochemical plants, nuclear waste disposal activity, incinerators, large livestock farms (dairy cows, pigs, poultry, etc.), PVC factories, metals production factories, plastics factories, and other heavy industry.
Some of the more common soil contaminants are chlorinated hydrocarbons (CFH), heavy metals (such as chromium, cadmium--found in rechargeable batteries, and lead--found in lead paint, aviation fuel and still in some countries, gasoline), MTBE, zinc, arsenic and benzene. Ordinary municipal landfills are the source of many chemical substances entering the soil environment (and often groundwater), emanating from the wide variety of refuse accepted, especially substances illegally discarded there, or from pre-1970 landfills that may have been subject to little control in the U.S. or EU.
Pollution can also be the consequence of a natural disaster. For example, hurricanes often involve water contamination from sewage, and petrochemical spills from ruptured boats or automobiles. Larger scale and environmental damage is not uncommon when coastal oil rigs or refineries are involved. Some sources of pollution, such as nuclear power plants or oil tankers, can produce widespread and potentially hazardous releases when accidents occur.
In the case of noise pollution the dominant source class is the motor vehicle, producing about ninety percent of all unwanted noise worldwide.
Effects on human health :
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Working women
Nowadays it is important for women to work outside the home because of economic reasons.Yet; this idea is still debated by many people. Some people argue that the family, especially small children, may be neglected. I believe that every woman has the right to work, but she should carefully consider the many problems she might encounter.
The major problems a working woman faces concern her children. She must either find a reliable person to look after them or a nursery school that the children can attend. But the big problem is that when the mother is at work, she may worry about her children. She may wonder if they are safe, if they are learning good values, and if her absence is hurting them emotionally.
After a mother takes into consideration all these problems above and perhaps other problems, she must decide if a job outside home is worth it.
I believe that in spite of all these obstacles, many mothers do work and manage a family successfully.
In Conclusion, it is a woman’s right to make this choice and only the woman herself should decide this matter.
Television
?Television has became part of our every day life .what are its advantages and disadvantages
On the one hand, TV has became the most influential means of the mass media because it has both sound and picture .it’s also the most popular source of information education and international , in brief TV brings the whole word to us.
One the other hand TV develops passive and lazy viewers .it also prevents communication between the members of the family besides students don’t their homwork and may became aggressive when they watch films of violence.
Working children
Child labour is one of the problems that many countries face, there are various causes that drive children to work some of them drop out of school in order to help their poor or sick parents others have to work because they are orphans. In addiction some parents are ignorant they think education is a waste of time.
Working children face a tough life; in factories and mines they work in bad conditions no fresh air, long hours they may be injured by machines they are also deprived of education and childhood
Racism
Racism or racialism is a form of race, especially the belief that one race is superior to another. Racism may be expressed individually and consciously, through explicit thoughts, feelings, or acts, or socially and unconsciously, through institutions that promote inequality between races.
In the 19th century many legitimized racist beliefs and practices through scientific theories about biological differences among races. Today, most scientists have rejected the biological basis of race or the validity of "race" as a scientific concept. Racism, then, becomes discrimination based on alleged race. Racists themselves usually do believe that humans are divided into different races.
There are two main definitions of racism today. One of them states that racism is dicrimination based on alleged race, the other - newer - one states that racism has started to include also discrimination based on religion or culture
right of women
Nowadays we take it for granted that women have the same rights as men before the first world war few people believed this.
As far as work was concerned there were jobs wich were regarded as women`s jobs and other wiche were regarded as men`s jobs. Women`s jobs were generally lower paid as men`s. Men did almost all the heavy jobs in industry or in transport.
Women had jobs like dress-making,cleanning or worked as servants.
Women`s main role was as being to raise childeren and look for their home. Women were not expected to take position of leaderschip. Women were not even allowed to vote in elections.
Before the war some women had been struggling to achieve greater equality with men. The most famous of these had been the suffragettes who stagged a violent campaign against the govervment from 1905 to 1914 trying to achieve the right to vote.however, at the outbreak of war, the were still no near to success. Many men argued that women were unsuited to such responsibility that women could not be trusted to vote sensibly that women should not concern themselves with such male activities and voting.
During the war many things changed.
الثلاثاء 5 يونيو - 3:30
