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EEE / Machu Picchu- part 4 (site location)
« on: March 05, 2015, 01:03:22 PM »
In the midst of a tropical mountain forest on the eastern slopes of the Peruvian Andes, Machu Picchu’s walls, terraces, stairways and ramps blend seamlessly into its natural setting. The site’s finely crafted stonework, terraced fields and sophisticated irrigation system bear witness to the Inca civilization’s architectural, agricultural and engineering prowess. Its central buildings are prime examples of a masonry technique mastered by the Incas in which stones were cut to fit together without mortar.
Archaeologists have identified several distinct sectors that together comprise the city, including a farming zone, a residential neighborhood, a royal district and a sacred area. Machu Picchu’s most distinct and famous structures include the Temple of the Sun and the Intihuatana stone, a sculpted granite rock that is believed to have functioned as a solar clock or calendar.

EEE / Machu Picchu- part 3( discovery)
« on: March 05, 2015, 01:01:34 PM »

In the summer of 1911 the American archaeologist Hiram Bingham arrived in Peru with a small team of explorers hoping to find Vilcabamba, the last Inca stronghold to fall to the Spanish. Traveling on foot and by mule, Bingham and his team made their way from Cuzco into the Urubamba Valley, where a local farmer told them of some ruins located at the top of a nearby mountain. The farmer called the mountain Machu Picchu, which translates to “old peak” in the native Quechua language. On July 24, after a tough climb to the mountain’s ridge in cold and drizzly weather, Bingham met a small group of peasants who showed him the rest of the way. Led by an 11-year-old boy, Bingham got his first glimpse of the intricate network of stone terraces marking the entrance to Machu Picchu.
The excited Bingham spread the word about his discovery in a best-selling book, “The Lost City of the Incas,” sending hordes of eager tourists flocking to Peru to follow in his footsteps up the formerly obscure Inca Trail. He also excavated artifacts from Machu Picchu and took them to Yale University for further inspection, igniting a custody dispute that lasted nearly 100 years. It was not until the Peruvian government filed a lawsuit and lobbied President Barack Obama for the return of the items that Yale agreed to complete their repatriation.

EEE / Machu Picchu- part 2
« on: March 05, 2015, 01:00:08 PM »
Historians believe Machu Picchu was built at the height of the Inca Empire, which dominated western South America in the 15th and 16th centuries. It was abandoned an estimated 100 years after its construction, probably around the time the Spanish began their conquest of the mighty pre-Columbian civilization in the 1530s. There is no evidence that the conquistadors ever attacked or even reached the mountaintop citadel, however; for this reason, some have suggested that the residents’ desertion occurred because of a smallpox epidemic.
Many modern-day archaeologists now believe that Machu Picchu served as a royal estate for Inca emperors and nobles. Others have theorized that it was a religious site, pointing to its proximity to mountains and other geographical features that the Incas held sacred. Dozens of alternate hypotheses have cropped up in the years since Machu Picchu was first unveiled to the world, with scholars variously interpreting it as a prison, a trade hub, a station for testing new crops, a women’s retreat or a city devoted to the coronation of kings, among many examples.

EEE / Machu Picchu- part 1
« on: March 05, 2015, 12:58:28 PM »
Tucked away in the rocky countryside northwest of Cuzco, Peru, Machu Picchu is believed to have been a royal estate or sacred religious site for Inca leaders, whose civilization was virtually wiped out by Spanish invaders in the 16th century. For hundreds of years, until the American archaeologist Hiram Bingham stumbled upon it in 1911, the abandoned citadel’s existence was a secret known only to peasants living in the region. The site stretches over an impressive 5-mile distance, featuring more than 3,000 stone steps that link its many different levels. Today, hundreds of thousands of people tramp through Machu Picchu every year, braving crowds and landslides to see the sun set over its towering stone monuments and marvel at the mysterious splendor of one of the world’s most famous manmade wonders.

EEE / Cotton gin
« on: March 05, 2015, 12:56:46 PM »
In 1794, U.S.-born inventor Eli Whitney (1765-1825) patented the cotton gin, a machine that revolutionized the production of cotton by greatly speeding up the process of removing seeds from cotton fiber. By the mid-19th century, cotton had become America’s leading export. Despite its success, the gin made little money for Whitney due to patent-infringement issues. Also, his invention offered Southern planters a justification to maintain and expand slavery even as a growing number of Americans supported its abolition. Based in part on his reputation for creating the cotton gin, Whitney later secured a major contract to build muskets for the U.S. government. Through this project, he promoted the idea of interchangeable parts–standardized, identical parts that made for faster assembly and easier repair of various devices. For his work, he is credited as a pioneer of American manufacturing.

EEE / Life sketch of Alexander Graham Bell (part-2)
« on: March 05, 2015, 12:46:20 PM »
In 1874 the essential idea of the telephone formed in his mind. As he later explained it, “If I could make a current of electricity vary in intensity precisely as the air varies in density during the production of sound, I should be able to transmit speech telegraphically.” Two years later he applied for a patent, which was granted on March 7, 1876. On March 10, the first coherent complete sentence—the famous “Mr. Watson, come here; I want you”—was transmitted in his laboratory.
In later years Bell experimented with a means to detect metal in wounds and with a vacuum-jacket respirator that led to the development of the iron lung. He helped bring Thomas A. Edison’s phonograph to commercial practicality and experimented with hydrofoil boats and with airplanes as early as the 1890s.
With the wealth derived from the telephone, Bell was able to assist the careers of other scientists. He also founded and helped finance the journal Science, today the premier American scientific journal, and the National Geographic Society.
While constantly engaged in scientific experiments, Bell crusaded tirelessly on behalf of the deaf, encouraging their integration into society with the help of lip-reading and other techniques. In 1890 he founded the Alexander Graham Bell Association for the Deaf.
He died in 1922 at his summer home on Cape Breton Island, Nova Scotia. People throughout North America were urged to refrain from making phone calls during his burial so that telephones would remain silent as a tribute.

EEE / Life sketch of Alexander Graham Bell (part-1)
« on: March 05, 2015, 12:44:43 PM »
Alexander Graham Bell (1847-1922), the Scottish-born American scientist best known as the inventor of the telephone, worked at a school for the deaf while attempting to invent a machine that would transmit sound by electricity. Bell was granted the first official patent for his telephone in March 1876, though he would later face years of legal challenges to his claim that he was its sole inventor, resulting in one of history’s longest patent battles. Bell continued his scientific work for the rest of his life, and used his success and wealth to establish various research centers nationwide.
Bell owes his immortality to his having been the first to design and patent a practical device for transmitting the human voice by means of an electric current. But Bell always described himself simply as a “teacher of the deaf,” and his contributions in that field were of the first order.
Bell, who was born in Edinburgh, Scotland, was educated there and at the University of London. He also studied under his grandfather, Alexander Bell, a noted speech teacher. He taught elocution, assisted his father, also a speech teacher and noted phonetician, and taught at a school for the deaf in England, using his father’s methods. In 1870, Bell immigrated with his parents to Canada.
Two years later he established a school for the deaf in Boston, Massachusetts, and the following year became a professor in speech and vocal physiology at Boston University. While teaching he experimented with a means of transmitting several telegraph messages simultaneously over a single wire and also with various devices to help the deaf learn to speak, including a means of graphically recording sound waves.

EEE / The glorious Mayan civilization (part6-mysterious decline)
« on: March 05, 2015, 12:35:03 PM »
From the late eighth through the end of the ninth century, something unknown happened to shake the Maya civilization to its foundations. One by one, the Classic cities in the southern lowlands were abandoned, and by A.D. 900, Maya civilization in that region had collapsed. The reason for this mysterious decline is unknown, though scholars have developed several competing theories.
Some believe that by the ninth century the Maya had exhausted the environment around them to the point that it could no longer sustain a very large population. Other Maya scholars argue that constant warfare among competing city-states led the complicated military, family (by marriage) and trade alliances between them to break down, along with the traditional system of dynastic power. As the stature of the holy lords diminished, their complex traditions of rituals and ceremonies dissolved into chaos. Finally, some catastrophic environmental change–like an extremely long, intense period of drought–may have wiped out the Classic Maya civilization. Drought would have hit cities like Tikal–where rainwater was necessary for drinking as well as for crop irrigation–especially hard.
All three of these factors–overpopulation and overuse of the land, endemic warfare and drought–may have played a part in the downfall of the Maya in the southern lowlands. In the highlands of the Yucatan, a few Maya cities–such as Chichén Itzá, Uxmal and Mayapán–continued to flourish in the Post-Classic Period (A.D. 900-1500). By the time the Spanish invaders arrived, however, most Maya were living in agricultural villages, their great cities buried under a layer of rainforest green.

EEE / The glorious Mayan civilization (part5-life in rainforest)
« on: March 05, 2015, 12:28:56 PM »
One of the many intriguing things about the Maya was their ability to build a great civilization in a tropical rainforest climate. Traditionally, ancient peoples had flourished in drier climates, where the centralized management of water resources (through irrigation and other techniques) formed the basis of society. (This was the case for the Teotihuacan of highland Mexico, contemporaries of the Classic Maya.) In the southern Maya lowlands, however, there were few navigable rivers for trade and transport, as well as no obvious need for an irrigation system.
By the late 20th century, researchers had concluded that the climate of the lowlands was in fact quite environmentally diverse. Though foreign invaders were disappointed by the region’s relative lack of silver and gold, the Maya took advantage of the area’s many natural resources, including limestone (for construction), the volcanic rock obsidian (for tools and weapons) and salt. The environment also held other treasures for the Maya, including jade, quetzal feathers (used to decorate the elaborate costumes of Maya nobility) and marine shells, which were used as trumpets in ceremonies and warfare.

EEE / The glorious Mayan civilization (part4-social life)
« on: March 05, 2015, 12:27:43 PM »
The Classic Maya built many of their temples and palaces in a stepped pyramid shape, decorating them with elaborate reliefs and inscriptions. These structures have earned the Maya their reputation as the great artists of Mesoamerica. Guided by their religious ritual, the Maya also made significant advances in mathematics and astronomy, including the use of the zero and the development of a complex calendar system based on 365 days. Though early researchers concluded that the Maya were a peaceful society of priests and scribes, later evidence–including a thorough examination of the artwork and inscriptions on their temple walls–showed the less peaceful side of Maya culture, including the war between rival Mayan city-states and the importance of torture and human sacrifice to their religious ritual.
Serious exploration of Classic Maya sites began in the 1830s. By the early to mid-20th century, a small portion of their system of hieroglyph writing had been deciphered, and more about their history and culture became known. Most of what historians know about the Maya comes from what remains of their architecture and art, including stone carvings and inscriptions on their buildings and monuments. The Maya also made paper from tree bark and wrote in books made from this paper, known as codices; four of these codices are known to have survived.

EEE / The glorious Mayan civilization (part3-Classical age)
« on: March 05, 2015, 12:24:24 PM »
The Classic Period, which began around A.D. 250, was the golden age of the Maya Empire. Classic Maya civilization grew to some 40 cities, including Tikal, Uaxactún, Copán, Bonampak, Dos Pilas, Calakmul, Palenque and Río Bec; each city held a population of between 5,000 and 50,000 people. At its peak, the Maya population may have reached 2,000,000.
Excavations of Maya sites have unearthed plazas, palaces, temples and pyramids, as well as courts for playing the ball
 that were ritually and politically significant to Maya culture. Maya cities were surrounded and supported by a large population of farmers. Though the Maya practiced a primitive type of “slash-and-burn” agriculture, they also displayed evidence of more advanced farming methods, such as irrigation and terracing.
[ courtesy:]

EEE / The glorious Mayan civilization (part2-early cities)
« on: March 05, 2015, 12:19:32 PM »
EARLY MAYA, 1800 B.C. TO A.D. 250
The earliest Maya settlements date to around 1800 B.C., or the beginning of what is called the Preclassic or Formative Period. The earliest Maya were agricultural, growing crops such as corn (maize), beans, squash and cassava (manioc). During the Middle Preclassic Period, which lasted until about 300 B.C., Maya farmers began to expand their presence both in the highland and lowland regions. The Middle Preclassic Period also saw the rise of the first major Mesoamerican civilization, the Olmecs. Like other Mesamerican peoples, such as the Zapotec, Totonac, Teotihuacán and Aztec, the Maya derived a number of religious and cultural traits–as well as their number system and their famous calendar–from the Olmec.
In addition to agriculture, the Preclassic Maya also displayed more advanced cultural traits like pyramid-building, city construction and the inscribing of stone monuments.
The Late Preclassic city of Mirador, in the northern Peten, was one of the greatest cities ever built in the pre-Columbian Americas. Its size dwarfed the Classic Maya capital of Tikal, and its existence proves that the Maya flourished centuries before the Classic Period.

EEE / The glorious Mayan civilization (part1-beginning)
« on: March 05, 2015, 12:17:44 PM »
The Maya Empire, centered in the tropical lowlands of what is now Guatemala, reached the peak of its power and influence around the sixth century A.D. The Maya excelled at agriculture, pottery, hieroglyph writing, calendar-making and mathematics, and left behind an astonishing amount of impressive architecture and symbolic artwork. Most of the great stone cities of the Maya were abandoned by A.D. 900, however, and since the 19th century scholars have debated what might have caused this dramatic decline.
The Maya civilization was one of the most dominant indigenous societies of Mesoamerica (a term used to describe Mexico and Central America before the 16th century Spanish conquest). Unlike other scattered indigenous populations of Mesoamerica, the Maya were centered in one geographical block covering all of the Yucatan Peninsula and modern-day Guatemala; Belize and parts of the Mexican states of Tabasco and Chiapas; and the western part of Honduras and El Salvador. This concentration showed that the Maya remained relatively secure from invasion by other Mesoamerican peoples.
Within that expanse, the Maya lived in three separate sub-areas with distinct environmental and cultural differences: the northern Maya lowlands on the Yucatan Peninsula; the southern lowlands in the Peten district of northern Guatemala and adjacent portions of Mexico, Belize and western Honduras; and the southern Maya highlands, in the mountainous region of southern Guatemala. Most famously, the Maya of the southern lowland region reached their peak during the Classic Period of Maya civilization (A.D. 250 to 900), and built the great stone cities and monuments that have fascinated explorers and scholars of the region.

EEE / The beginning of Internet : World wide web (p-5)
« on: March 05, 2015, 10:05:31 AM »
Cerf’s protocol transformed the Internet into a worldwide network. Throughout the 1980s, researchers and scientists used it to send files and data from one computer to another. However, in 1991 the Internet changed again. That year, a computer programmer in Switzerland named Tim Berners-Lee introduced the World Wide Web: an Internet that was not simply a way to send files from one place to another but was itself a “web” of information that anyone on the Internet could retrieve. Berners-Lee created the Internet that we know today.
Since then, the Internet has changed in many ways. In 1992, a group of students and researchers at the University of Illinois developed a sophisticated browser that they called Mosaic. (It later became Netscape.) Mosaic offered a user-friendly way to search the Web: It allowed users to see words and pictures on the same page for the first time and to navigate using scrollbars and clickable links. That same year, Congress decided that the Web could be used for commercial purposes. As a result, companies of all kinds hurried to set up websites of their own, and e-commerce entrepreneurs began to use the Internet to sell goods directly to customers. More recently, social networking sites like Facebook have become a popular way for people of all ages to stay connected.

EEE / The beginning of Internet : Rapid growth (p-4)
« on: March 05, 2015, 10:04:29 AM »
By the end of 1969, just four computers were connected to the ARPAnet, but the network grew steadily during the 1970s. In 1971, it added the University of Hawaii’s ALOHAnet, and two years later it added networks at London’s University College and the Royal Radar Establishment in Norway. As packet-switched computer networks multiplied, however, it became more difficult for them to integrate into a single worldwide “Internet.”
By the end of the 1970s, a computer scientist named Vinton Cerf had begun to solve this problem by developing a way for all of the computers on all of the world’s mini-networks to communicate with one another. He called his invention “Transmission Control Protocol,” or TCP. (Later, he added an additional protocol, known as “Internet Protocol.” The acronym we use to refer to these today is TCP/IP.) One writer describes Cerf’s protocol as “the ‘handshake’ that introduces distant and different computers to each other in a virtual space.”

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