Ibn Khaldun Short Biograph

Ibn Khaldun's life is relatively well-documented, as he wrote an autobiography (التعريف بابن خلدون ورحلته غربا وشرقا; Al-Taʻrīf bi Ibn-Khaldūn wa Riħlatuhu Għarbān wa Sharqān) in which numerous documents regarding his life are quoted word-for-word. However, the autobiography has little to say about his private life, so little is known about his family background. Generally known as "Ibn Khaldūn" after a remote ancestor, he was born in Tunis in AD 1332 (732 A.H.) into an upper-class Andalusian family, the Banū Khaldūn. His family, which held many high offices in Andalusia, had emigrated toTunisia after the fall of Seville to Reconquista forces around the middle of the 13th century. Under the Tunisian Hafsid dynasty some of his family held political office; Ibn Khaldūn's father and grandfather however withdrew from political life and joined a mystical order. His brother, Yahya Ibn Khaldun, was also a historian who wrote a book on the Abdalwadid dynasty, and who was assassinated by a rival for being the official historiographer of the court.

In his autobiography, Ibn Khaldun traces his descent back to the time of Muhammad through an Arab tribe from Yemen, specifically Hadhramaut, which came to Spain in the eighth century at the beginning of the Islamic conquest. In his own words: "And our ancestry is from Hadhramaut, from the Arabs of Yemen, via Wa'il ibn Hajar, from the best of the Arabs, well-known and respected. However, the biographer Mohammad Enan questions his claim, suggesting that his family may have been Muladis who pretended to be of Arab origin in order to gain social status. nEnan also mentions a well documented past tradition, concerning certain Berber groups, whereby they delusively "aggrandize" themselves with some Arab ancestry. The motive of such an invention was always the desire for political and societal ascendancy. Some speculate this of the Khaldun family; they elaborate that Ibn Khaldun himself was the product of the same Berber ancestry as the native majority of his birthplace. A point congenial to this posits that Ibn Khaldun's unusual written focus on, and admiration for Berbers reveals a deference towards them that is born of a vested interest in preserving them in the realm of conscious history; such is that which the true Arabs of his day would find no enthusiasm for and indeed a vested interest in suppressing. Moreover the special position that he affords Berbers in his work is fully vindicated upon comparing it with his vitriolic attitudes towards the Arab, and his relative disinterest in the state of affairs outside the Maghreb. In contrast, Muhammad Hozien chooses to believe: "The false [Berber] identity would be valid however at the time that Ibn Khaldun's ancestors left Andalusia and moved to Tunisia they did not change their claim to Arab ancestry. Even in the times when Berbers were ruling in Al-Andalus, the reigns of Almoravids and Almohads, the Ibn Khalduns did not reclaim their Berber heritage.". This point ignores the aforementioned phenomenon of adopting an Arab ancestry to garner prestige. He was also an Islamic Pantheist.

Education

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His family's high rank enabled Ibn Khaldun to study with the best teachers in Maghreb. He received a classical Islamic education, studying the Qur'an which he memorized by heart, Arabic linguistics, the basis for an understanding of the Qur'an, hadith, sharia (law) and fiqh (jurisprudence). He received certification (ijazah) for all these subjects. The mathematician and philosopher,Al-Abili of Tlemcen, introduced him to mathematics, logic and philosophy, where he above all studied the works of Averroes, Avicenna, Razi and Tusi. At the age of 17, Ibn Khaldūn lost both his parents to the Black Death, an intercontinental epidemic of the plague that hit Tunis in 1348–1349.

Following family tradition, Ibn Khaldūn strove for a political career. In the face of a tumultuous political situation in North Africa, this required a high degree of skill developing and dropping alliances prudently, to avoid falling with the short-lived regimes of the time. Ibn Khaldūn's autobiography is the story of an adventure, in which he spends time in prison, reaches the highest offices and falls again into exile.

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Friends (easy essay)

  Friends are people whom we turn to when our spirits need a lift. They are always by our side through thick and thin. They stand beside us even when our disposition is not perfectly right and will fight for us if we are oppressed. 

  Therefore, it is clear that friends play a vital role in shaping who we are today. But what qualities exactly do we need to look for in a friend?
A friend should always be caring towards you. He or she should take interest in your problems no matter how big or petty your problem may be. A friend should be able to sit beside you and encourage you to keep your chin up even when everyone else is against you. A friend’s empathy and lovingness will also replenish your worn-out soul and will make you realize how important a friend really is.

  Apart from that, a friend should be an honest person. An honest friend will dissipate any worries that he or she is lying towards you. A friend’s honesty will enable you to trust his or she’s opinion when it comes to telling you the truth about yourself. For example, an honest friend will remand you on your declining grades and will ask you to work harder while a dishonest friend will see it with a blind eye. Therefore, an overall improvement in yourself will be noticeable if you have an honest friend.

  Moreover, a friend should be generous both emotionally and knowledge wise. A friend who is generous ought to be able to connect with you and provide emotional support. He or she should also be generous when it comes to sharing knowledge. A true friend must be ever-ready to help you when you are inept in certain subjects. A friend can easily guide you towards understanding the subject matter better as he or she is often on the same page as you. The only difference is that you can’t quite grasp the content of the page per se.

  Besides that, a friend must also be able to humour you. Humour plays a quintessential role in making your day more lively and enjoyable. Friends who pull your leg and mess about will indefinitely make life seem so much better. As they say, laughter is the best medicine and a little levity on rainy days is always welcomed. 
In conclusion, friends are people we spend most of our time with. Thus, we have to be selective when it comes to choosing our friends.

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Steam engine

A steam engine is a heat engine that performs mechanical work using steam as its working fluid.

Steam engines are external combustion engines, where the working fluid is separate from the combustion products. Non-combustion heat sources such as solar power, nuclear power or geothermal energy may be used. Water is heated into steam in a boiler until it reaches a high pressure. When expanded through pistons or turbines, mechanical work is done. The reduced-pressure steam is then released into the atmosphere or condensed and pumped back into the boiler. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle. Most mobile steam engines and some smaller stationary engines discard the low-pressure steam instead of condensing it for reuse.

The idea of using boiling water to produce mechanical motion has a very long history, going back about 2,000 years. Early devices were not practical power producers, but more advanced designs producing usable power have become a major source of mechanical power over the last 300 years, beginning with applications for removing water from mines using vacuum engines. Subsequent developments used pressurized steam and converted linear to rotational motion which enabled the powering of a wide range of manufacturing machinery. These engines could be sited anywhere that water and coal or wood fuel could be obtained, whereas previous installations were limited to locations where water wheels or windmills could be used. Significantly, this power source would later be applied to vehicles such as steam tractors and railway locomotives. The steam engine was a critical component of the Industrial Revolution, providing the prime mover for modern mass-production manufacturing methods. Modern steam turbines generate about 90% of the electric power in the United States using a variety of heat sources.

In general usage, the term steam engine can refer to either the integrated steam plants (including boilers etc.) such as railway steam locomotives andportable engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine. Specialized devices such as steam hammers and steam pile drivers are dependent on steam supplied from a separate boiler

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Alexander Graham Bell- Biography (Verb)

Alexander Graham Bell might easily have been content with the success of his telephone invention. His many laboratory notebooks demonstrate, however, that he was driven by a genuine and rare intellectual curiosity that kept him regularly searching, striving, and wanting always to learn and to create. He would continue to test out new ideas through a long and productive life. He would explore the realm of communications as well as engage in a great variety of scientific activities involving kites, airplanes, tetrahedral structures, sheep-breeding, artificial respiration, desalinization and water distillation, and hydrofoils.

With the enormous technical and later financial success of his telephone invention, Alexander Graham Bell's future was secure, and he was able to arrange his life so that he could devote himself to his scientific interests. Toward this end, in 1881, he used the $10,000 award for winning France's Volta Prize to set up the Volta Laboratory in Washington, D.C. A believer in scientific teamwork, Bell worked with two associates, his cousin Chichester Bell and Charles Sumner Tainter, at the Volta Laboratory. Their experiments soon produced such major improvements in Thomas Edison's phonograph that it became commercially viable. After 1885, when he first visited Nova Scotia, Bell set up another laboratory there at his estate, Beinn Bhreagh (pronounced Ben Vreeah), near Baddeck, where he would assemble other teams of bright young engineers to pursue new and exciting ideas.

Among one of his first innovations after the telephone was the "photophone," a device that enabled sound to be transmitted on a beam of light. Bell and his assistant, Charles Sumner Tainter, developed the photophone using a sensitive selenium crystal and a mirror that would vibrate in response to a sound. In 1881, they successfully sent a photophone message over 200 yards from one building to another. Bell regarded the photophone as "the greatest invention I have ever made; greater than the telephone." Alexander Graham Bell's invention reveals the principle upon which today's laser and fiber optic communication systems are founded, though it would take the development of several modern technologies to realize it fully.

Over the years, Alexander Graham Bell's curiosity would lead him to speculate on the nature of heredity, first among the deaf and later with sheep born with genetic irregularities. His sheep-breeding experiments at Beinn Bhreagh sought to increase the numbers of twin and triplet births. Bell was also willing to attempt inventing under the pressure of daily events, and in 1881 he hastily constructed an electromagnetic device called an induction balance to try and locate a bullet lodged in President Garfield after an assassin had shot him. He later improved this and produced a device called a telephone probe, which would make a telephone receiver click when it touched metal. That same year, Bell's newborn son, Edward, died from respiratory problems, and Bell responded to that tragedy by designing a metal vacuum jacket that would facilitate breathing. This apparatus was a forerunner of the iron lung used in the 1950s to aid polio victims. In addition to inventing the audiometer to detect minor hearing problems and conducting experiments with what today are called energy recycling and alternative fuels, Bell also worked on methods of removing salt from seawater.

However, these interests may be considered minor activities compared to the time and effort he put into the challenge of flight. By the 1890s, Bell had begun experimenting with propellers and kites. His work led him to apply the concept of the tetrahedron (a solid figure with four triangular faces) to kite design as well as to create a new form of architecture. In 1907, four years after the Wright Brothers first flew at Kitty Hawk, Bell formed the Aerial Experiment Association with Glenn Curtiss, William "Casey" Baldwin, Thomas Selfridge, and J.A.D. McCurdy, four young engineers whose common goal was to create airborne vehicles. By 1909, the group had produced four powered aircraft, the best of which, theSilver Dart, made the first successful powered flight in Canada on February 23, 1909. Bell spent the last decade of his life improving hydrofoil designs, and in 1919 he and Casey Baldwin built a hydrofoil that set a world water-speed record that was not broken until 1963. Months before he died, Bell told a reporter, "There cannot be mental atrophy in any person who continues to observe, to remember what he observes, and to seek answers for his unceasing hows and whys about things.

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History About Apple IPhone (Nouns)

In April 2003 at the "D: All Things Digital" executive conference, Jobs expressed his belief that tablet PCs and traditional PDAs were not good choices as high-demand markets for Apple to enter, despite many requests made to him that Apple create another PDA. He did believe that cell phones were going to become important devices for portable information access, and that what cell phones needed to have was excellent synchronization software. At the time, instead of focusing on a follow-up to their Newton PDA, Jobs had Apple put its energies into the iPod, and the iTunessoftware (which can be used to synchronize content with iPod devices), released January 2001. On September 7, 2005, Apple and Motorola released the ROKR E1, the first mobile phone to use iTunes. Jobs was unhappy with the ROKR, feeling that having to compromise with a non-Apple designer (Motorola) prevented Apple from designing the phone they wanted to make.^[14] In September 2006, Apple discontinued support for the ROKR and released a version of iTunes that included references to an as-yet unknown mobile phone that could display pictures and video.^[15]

On January 9, 2007 Steve Jobs announced the iPhone at the Macworld convention, receiving substantial media attention,^[16] and that it would be released later that year. On 29th of June 2007 the first iPhone was released.

On June 11, 2007 announced at the Apple's Worldwide Developers Conference that the iPhone would support third-party applications using the Safari engine on the device. Third-parties would create the Web 2.0 applications and users would access them via the internet.^[17] Such applications appeared even before the release of the iPhone; the first being "OneTrip", a program meant to keep track of the user's shopping list.^[18] On June 29, 2007, Apple released version 7.3 of iTunes to coincide with the release of the iPhone.^[19] This release contains support for iPhone service activation and syncing.

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