Vermont is a state in the New England region of the northeastern United States. It borders the U. S. states of Massachusetts to the south, New Hampshire to the east, New York to the west, the Canadian province of Quebec to the north. Vermont is the second-smallest by population and the sixth-smallest by area of the 50 U. S. states. The state capital is the least populous state capital in the United States; the most populous city, Burlington, is the least populous city to be the most populous city in a state. As of 2015, Vermont was the leading producer of maple syrup in the United States. In crime statistics, it was ranked as the safest state in the country in 2016. For thousands of years, indigenous peoples, including the Mohawk and the Algonquian-speaking Abenaki, occupied much of the territory, now Vermont and was claimed by France's colony of New France. France ceded the territory to Great Britain after being defeated in 1763 in the Seven Years' War. Thereafter, the nearby colonies the provinces of New Hampshire and New York, disputed the extent of the area called the New Hampshire Grants to the west of the Connecticut River, encompassing present-day Vermont.
The provincial government of New York sold land grants to settlers in the region, which conflicted with earlier grants from the government of New Hampshire. The Green Mountain Boys militia protected the interests of the established New Hampshire land grant settlers against the newly arrived settlers with land titles granted by New York. A group of settlers with New Hampshire land grant titles established the Vermont Republic in 1777 as an independent state during the American Revolutionary War; the Vermont Republic abolished slavery before any of the other states. Vermont was admitted to the newly established United States as the fourteenth state in 1791. Vermont is one of only four U. S. states that were sovereign states, given that the original 13 states were former colonies. During the mid 19th century, Vermont was a strong source of abolitionist sentiment and sent a significant contingent of soldiers to participate in the American Civil War. Protestants and Catholics make up the majority of those reporting a religious preference with 37% reporting no religion.
Other religions individually contribute no more than 2% to the total. The geography of the state is marked by the Green Mountains, which run north–south up the middle of the state, separating Lake Champlain and other valley terrain on the west from the Connecticut River valley that defines much of its eastern border. A majority of its terrain is forested with conifers. A majority of its open land is in agriculture; the state's climate is characterized by cold, snowy winters. Vermont's economic activity of $26 billion in 2010 caused it to rank 34th in gross state product, it has been ranked 42nd as a state in. In 1960, Vermonters' politics started to shift from being reliably Republican towards favoring more liberal and progressive candidates. Starting in 1963, voters have alternated between choosing Democratic governors. Voters have chosen Democrats for president since 1992. In 2000, the state legislature was the first to recognize civil unions for same-sex couples; the origin of the name "Vermont" is uncertain, but comes from the French Les Monts Verts, meaning "the Green Mountains".
Thomas Young introduced it in 1777. In 1913, the Secretary of State of Vermont speculated that the archaic French term Mont Verd may have inspired Young. Another source points out the predominance of mica-quartz-chlorite schist, a green-hued metamorphosed shale, as a possible reason; the Green Mountains form a north–south spine running most of the length of the state west of its center. In the southwest portion of the state are located the Taconic Mountains. In the northwest, near Lake Champlain, is the fertile Champlain Valley. In the south of the valley is Lake Bomoseen. Vermont is located in the New England region of the Northeastern United States and comprises 9,614 square miles, making it the 45th-largest state, it is the only state. Land comprises 9,250 square miles and water comprises 365 square miles, making it the 43rd-largest in land area and the 47th in water area. In total area, it is smaller than Haiti, it is the only landlocked state in New England, it is the easternmost and the smallest in area of all landlocked states.
The west bank of the Connecticut River marks the state's eastern border with New Hampshire, though much of the river is within New Hampshire's territory. 41% of Vermont's land area is part of the Connecticut River's watershed. Lake Champlain, the sixth-largest body of fresh water in the United States, separates Vermont from New York in the northwest portion of the state. From north to south, Vermont is 159 miles long, its greatest width, from east to west, is 89 miles at the Canada–U. S. Border; the width averages 60.5 miles. The state's geographic center is three miles east of Roxbury, in Washington County. There are fifteen U. S. federal border crossings between Canada. Several mountains have timberlines with delicate year-round alpine ecosystems, including Mount Mansfield, the highest mountain in the state. Areas in Vermont a
Chicago the City of Chicago, is the most populous city in Illinois, as well as the third most populous city in the United States. With an estimated population of 2,716,450, it is the most populous city in the Midwest. Chicago is the principal city of the Chicago metropolitan area referred to as Chicagoland, the county seat of Cook County, the second most populous county in the United States; the metropolitan area, at nearly 10 million people, is the third-largest in the United States, the fourth largest in North America and the third largest metropolitan area in the world by land area. Located on the shores of freshwater Lake Michigan, Chicago was incorporated as a city in 1837 near a portage between the Great Lakes and the Mississippi River watershed and grew in the mid-nineteenth century. After the Great Chicago Fire of 1871, which destroyed several square miles and left more than 100,000 homeless, the city made a concerted effort to rebuild; the construction boom accelerated population growth throughout the following decades, by 1900 Chicago was the fifth largest city in the world.
Chicago made noted contributions to urban planning and zoning standards, including new construction styles, the development of the City Beautiful Movement, the steel-framed skyscraper. Chicago is an international hub for finance, commerce, technology, telecommunications, transportation, it is the site of the creation of the first standardized futures contracts at the Chicago Board of Trade, which today is the largest and most diverse derivatives market gobally, generating 20% of all volume in commodities and financial futures. O'Hare International Airport is the one of the busiest airports in the world, the region has the largest number of U. S. highways and greatest amount of railroad freight. In 2012, Chicago was listed as an alpha global city by the Globalization and World Cities Research Network, it ranked seventh in the entire world in the 2017 Global Cities Index; the Chicago area has one of the highest gross domestic products in the world, generating $680 billion in 2017. In addition, the city has one of the world's most diversified and balanced economies, not being dependent on any one industry, with no single industry employing more than 14% of the workforce.
Chicago's 58 million domestic and international visitors in 2018, made it the second most visited city in the nation, behind New York City's approximate 65 million visitors. The city ranked first place in the 2018 Time Out City Life Index, a global quality of life survey of 15,000 people in 32 cities. Landmarks in the city include Millennium Park, Navy Pier, the Magnificent Mile, the Art Institute of Chicago, Museum Campus, the Willis Tower, Grant Park, the Museum of Science and Industry, Lincoln Park Zoo. Chicago's culture includes the visual arts, film, comedy and music jazz, soul, hip-hop and electronic dance music including house music. Of the area's many colleges and universities, the University of Chicago, Northwestern University, the University of Illinois at Chicago are classified as "highest research" doctoral universities. Chicago has professional sports teams in each of the major professional leagues, including two Major League Baseball teams; the name "Chicago" is derived from a French rendering of the indigenous Miami-Illinois word shikaakwa for a wild relative of the onion, known to botanists as Allium tricoccum and known more as ramps.
The first known reference to the site of the current city of Chicago as "Checagou" was by Robert de LaSalle around 1679 in a memoir. Henri Joutel, in his journal of 1688, noted that the eponymous wild "garlic" grew abundantly in the area. According to his diary of late September 1687:...when we arrived at the said place called "Chicagou" which, according to what we were able to learn of it, has taken this name because of the quantity of garlic which grows in the forests in this region. The city has had several nicknames throughout its history such as the Windy City, Chi-Town, Second City, the City of the Big Shoulders, which refers to the city's numerous skyscrapers and high-rises. In the mid-18th century, the area was inhabited by a Native American tribe known as the Potawatomi, who had taken the place of the Miami and Sauk and Fox peoples; the first known non-indigenous permanent settler in Chicago was Jean Baptiste Point du Sable. Du Sable arrived in the 1780s, he is known as the "Founder of Chicago".
In 1795, following the Northwest Indian War, an area, to be part of Chicago was turned over to the United States for a military post by native tribes in accordance with the Treaty of Greenville. In 1803, the United States Army built Fort Dearborn, destroyed in 1812 in the Battle of Fort Dearborn and rebuilt; the Ottawa and Potawatomi tribes had ceded additional land to the United States in the 1816 Treaty of St. Louis; the Potawatomi were forcibly removed from their land after the Treaty of Chicago in 1833. On August 12, 1833, the Town of Chicago was organized with a population of about 200. Within seven years it grew to more than 4,000 people. On June 15, 1835, the first public land sales began with Edmund Dick Taylor as U. S. Receiver of Public Monies; the City of Chicago was incorporated on Saturday, March 4, 1837, for several decades was the world's fastest-growing city. As the site of the Chicago Portage, the city became an important transportation hub between the eastern and western United States.
Chicago's first railway and Chicago Union Railroad, the Illi
Physics is the natural science that studies matter, its motion, behavior through space and time, that studies the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, its main goal is to understand how the universe behaves. Physics is one of the oldest academic disciplines and, through its inclusion of astronomy the oldest. Over much of the past two millennia, chemistry and certain branches of mathematics, were a part of natural philosophy, but during the scientific revolution in the 17th century these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, the boundaries of physics which are not rigidly defined. New ideas in physics explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics enable advances in new technologies.
For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have transformed modern-day society, such as television, domestic appliances, nuclear weapons. Astronomy is one of the oldest natural sciences. Early civilizations dating back to beyond 3000 BCE, such as the Sumerians, ancient Egyptians, the Indus Valley Civilization, had a predictive knowledge and a basic understanding of the motions of the Sun and stars; the stars and planets were worshipped, believed to represent gods. While the explanations for the observed positions of the stars were unscientific and lacking in evidence, these early observations laid the foundation for astronomy, as the stars were found to traverse great circles across the sky, which however did not explain the positions of the planets. According to Asger Aaboe, the origins of Western astronomy can be found in Mesopotamia, all Western efforts in the exact sciences are descended from late Babylonian astronomy.
Egyptian astronomers left monuments showing knowledge of the constellations and the motions of the celestial bodies, while Greek poet Homer wrote of various celestial objects in his Iliad and Odyssey. Natural philosophy has its origins in Greece during the Archaic period, when pre-Socratic philosophers like Thales rejected non-naturalistic explanations for natural phenomena and proclaimed that every event had a natural cause, they proposed ideas verified by reason and observation, many of their hypotheses proved successful in experiment. The Western Roman Empire fell in the fifth century, this resulted in a decline in intellectual pursuits in the western part of Europe. By contrast, the Eastern Roman Empire resisted the attacks from the barbarians, continued to advance various fields of learning, including physics. In the sixth century Isidore of Miletus created an important compilation of Archimedes' works that are copied in the Archimedes Palimpsest. In sixth century Europe John Philoponus, a Byzantine scholar, questioned Aristotle's teaching of physics and noting its flaws.
He introduced the theory of impetus. Aristotle's physics was not scrutinized until John Philoponus appeared, unlike Aristotle who based his physics on verbal argument, Philoponus relied on observation. On Aristotle's physics John Philoponus wrote: “But this is erroneous, our view may be corroborated by actual observation more than by any sort of verbal argument. For if you let fall from the same height two weights of which one is many times as heavy as the other, you will see that the ratio of the times required for the motion does not depend on the ratio of the weights, but that the difference in time is a small one, and so, if the difference in the weights is not considerable, that is, of one is, let us say, double the other, there will be no difference, or else an imperceptible difference, in time, though the difference in weight is by no means negligible, with one body weighing twice as much as the other”John Philoponus' criticism of Aristotelian principles of physics served as an inspiration for Galileo Galilei ten centuries during the Scientific Revolution.
Galileo cited Philoponus in his works when arguing that Aristotelian physics was flawed. In the 1300s Jean Buridan, a teacher in the faculty of arts at the University of Paris, developed the concept of impetus, it was a step toward the modern ideas of momentum. Islamic scholarship inherited Aristotelian physics from the Greeks and during the Islamic Golden Age developed it further placing emphasis on observation and a priori reasoning, developing early forms of the scientific method; the most notable innovations were in the field of optics and vision, which came from the works of many scientists like Ibn Sahl, Al-Kindi, Ibn al-Haytham, Al-Farisi and Avicenna. The most notable work was The Book of Optics, written by Ibn al-Haytham, in which he conclusively disproved the ancient Greek idea about vision, but came up with a new theory. In the book, he presented a study of the phenomenon of the camera obscura (his thousand-year-old
Soong Ching-ling was a Chinese political figure. As the third wife of Sun Yat-sen, one of the leaders of the 1911 revolution that established the Republic of China, she was referred to as Madame Sun Yat-sen, she was a member of the Soong family and, together with her siblings, played a prominent role in China's politics prior to and after 1949. After the establishment of the People's Republic of China in 1949, she held several prominent positions in the new government, including Vice President of China and Vice Chairman of the Standing Committee of the National People's Congress, travelled abroad during the early 1950s, representing her country at a number of international events. During the Cultural Revolution, she was criticized. Following the purge of President Liu Shaoqi in 1968, she and Dong Biwu as Vice Presidents became de facto Heads of State of China until 1972, when Dong was appointed Acting President. Soong survived the political turmoil during the Cultural Revolution, but only appeared less after 1976.
As the Chairwoman of the Standing Committee of the National People's Congress from 1976 to 1978, Soong was the Head of State. During her final illness in May 1981, she was given the special title of "Honorary President of the People's Republic of China". Soong Ching-ling was born to businessman and missionary Charlie Soong in Chuansha, Shanghai, the second of six children, she graduated from McTyeire School for Girls in Shanghai, Wesleyan College in Macon, United States. Like her sisters, she spoke fluent English due to being educated in English for most of her life, her Christian name was Rosamonde. Soong married Sun Yat-sen, leader of China's 1911 revolution and founder of the Kuomintang, on 25 October 1915 though her parents opposed the match. After Sun's death in 1925, she was elected to the KMT Central Executive Committee. However, she left China for Moscow after the expulsion of the Communists from the KMT in 1927, accusing the KMT of betraying her husband's legacy, her younger sister, May-ling, married Chiang Kai-shek shortly afterward, making Chiang Soong's brother-in-law.
Soong returned to China in June 1929 when Sun Yat-sen was moved from his temporary burial site in Beijing to a new memorial in Nanjing, but left again three months and did not return until July 1931, when her mother died. She resided afterwards in Shanghai until July 1937. Following the outbreak of hostilities, she moved first to Hong Kong to Chongqing, the wartime capital of the Chinese government. In 1939, she founded the China Defense League, which raised funds and sought supplies for the Chinese Communist controlled areas of northern China. In 1946, the League was renamed the China Welfare fund, continuing to seek funds and support for the Chinese Communists. During the Chinese Civil War, Soong supported the Communists. In 1948, she became honorary chairwoman of the Revolutionary Committee of the Kuomintang, a left-wing splinter group of the KMT that claimed to be the legitimate heir of Sun's legacy. With the collapse of the Nationalist government and the Communist victory in the civil war, she left Shanghai in September 1949 to attend the Chinese People's Political Consultative Conference, convened in Beijing by the Chinese Communist Party to establish a new Central People's Government.
On 1 October, she was a guest at the ceremony in Tiananmen Square marking the birth of the new People's Republic of China. The Nationalist government issued an order for her arrest, but this was soon commuted by the swift military victory of the Communists; the KMT fled from mainland China to Taiwan soon after this. Soong was held in great esteem by the victorious Communists, who reckoned her as a link between their movement and Sun's earlier movement. After the formal establishment of the People's Republic of China in 1949, she became one of six vice chairpeople of the Central People's Government, one of several vice-chairpeople of the Sino-Soviet Friendship Association. In April 1951, it was announced that she had been awarded the Stalin Peace Prize for 1950. In 1950, Soong became chairwoman of the Chinese People's Relief Administration, which combined several organizations dealing with welfare and relief issues, her China Welfare Fund was reorganized as the China Welfare Institute and began publishing the magazine China Reconstructs, now published as China Today.
In 1953, a collection of her writings, Struggle for New China, was published. In 1953 Soong served on the committees preparing for elections to the new National People's Congress and the drafting of the 1954 constitution. Soong was elected a Shanghai deputy to the first NPC, which adopted the constitution at its first meeting in September 1954, she was elected one of 14 vice-chairpeople of the NPC's standing committee, chaired by Liu Shaoqi. In December of the same year, she was elected a vice-chairwoman of the CPPCC, which became a consultative body, replaced Liu Shaoqi as chairperson of the Sino-Soviet Friendship Association. During this period, Soong traveled abroad several times, visiting Austria, Burma and Indonesia, her trips included a January 1953 visit to the Soviet Union, where she was received by Stalin shortly before his death. She visited Moscow again in 1957 with Mao Zedong's delegation to the 40th anniversary of the Russian Revolution. In April 1959, Soong
Cable News Network is an American news-based pay television channel owned by WarnerMedia News & Sports, a division of AT&T's WarnerMedia. CNN was founded in 1980 by American media proprietor Ted Turner as a 24-hour cable news channel. Upon its launch, CNN was the first television channel to provide 24-hour news coverage, was the first all-news television channel in the United States. While the news channel has numerous affiliates, CNN broadcasts from the Time Warner Center in New York City, studios in Washington, D. C. and Los Angeles. Its headquarters at the CNN Center in Atlanta is only used for weekend programming. CNN is sometimes referred to as CNN/U. S. to distinguish the American channel from CNN International. As of August 2010, CNN is available in over 100 million U. S. households. Broadcast coverage of the U. S. channel extends to over 890,000 American hotel rooms, as well as carriage on subscription providers throughout Canada. As of July 2015, CNN is available to about 96,374,000 pay-television households in the United States.
Globally, CNN programming airs through CNN International, which can be seen by viewers in over 212 countries and territories. The Cable News Network was launched at 5:00 p.m. Eastern Time on June 1, 1980. After an introduction by Ted Turner, the husband and wife team of David Walker and Lois Hart anchored the channel's first newscast. Burt Reinhardt, the executive vice president of CNN at its launch, hired most of the channel's first 200 employees, including the network's first news anchor, Bernard Shaw. Since its debut, CNN has expanded its reach to a number of cable and satellite television providers, several websites, specialized closed-circuit channels; the company has 42 bureaus, more than 900 affiliated local stations, several regional and foreign-language networks around the world. The channel's success made a bona-fide mogul of founder Ted Turner and set the stage for conglomerate Time Warner's eventual acquisition of the Turner Broadcasting System in 1996. A companion channel, CNN2, was launched on January 1, 1982 and featured a continuous 24-hour cycle of 30-minute news broadcasts.
The channel, which became known as CNN Headline News and is now known as HLN focused on live news coverage supplemented by personality-based programs during the evening and primetime hours. The first Persian Gulf War in 1991 was a watershed event for CNN that catapulted the channel past the "Big Three" American networks for the first time in its history due to an unprecedented, historical scoop: CNN was the only news outlet with the ability to communicate from inside Iraq during the initial hours of the Coalition bombing campaign, with live reports from the al-Rashid Hotel in Baghdad by reporters Bernard Shaw, John Holliman and Peter Arnett; the moment when bombing began was announced on CNN by Shaw on January 16, 1991, as follows: This is Bernie Shaw. Something is happening outside.... Peter Arnett, join me here. Let's describe to our viewers what we're seeing... The skies over Baghdad have been illuminated.... We're seeing bright flashes going off all over the sky. Unable to broadcast live pictures from Baghdad, CNN's coverage of the initial hours of the Gulf War had the dramatic feel of a radio broadcast – and was compared to legendary CBS news anchor Edward R. Murrow's gripping live radio reports of the German bombing of London during World War II.
Despite the lack of live pictures, CNN's coverage was carried by television stations and networks around the world, resulting in CNN being watched by over a billion viewers worldwide. The Gulf War experience brought CNN some much sought-after legitimacy and made household names of obscure reporters. In 2000, media scholar and director of the Center for the Study of Popular Television at Syracuse University, Robert Thompson, stated that having turned 20, CNN was now the "old guard." Shaw, known for his live-from-Bagdhad reporting during the Gulf War, became CNN's chief anchor until his retirement in 2001. Others include then-Pentagon correspondent Wolf Blitzer and international correspondent Christiane Amanpour. Amanpour's presence in Iraq was caricatured by actress Nora Dunn as ruthless reporter Adriana Cruz in the 1999 film Three Kings. Time Warner-owned sister network HBO produced a television movie, Live from Baghdad, about CNN's coverage of the first Gulf War. Coverage of the first Gulf War and other crises of the early 1990s led officials at the Pentagon to coin the term "the CNN effect" to describe the perceived impact of real time, 24-hour news coverage on the decision-making processes of the American government.
CNN was the first cable news channel. Anchor Carol Lin was on the air to deliver the first public report of the event, she broke into a commercial at 8:49 a.m. Eastern Time that morning and said:This just in. You are looking at a disturbing live shot there; that is the World Trade Center, we have unconfirmed reports this morning that a plane has crashed into one of the towers of the World Trade Center. CNN Center right now is just beginning to work on this story calling our sources and trying to figure out what happened, but something devastating happening this morning there on the south end of the island of Manhattan; that is once again, a picture of one of the towers of the World Trade Center. Sean Murtagh, CNN vice president of finance and administration, was the first network employe
Hiroshima is the capital of Hiroshima Prefecture and the largest city in the Chūgoku region of western Honshu, the largest island of Japan. Hiroshima gained city status on April 1, 1889. On April 1, 1980, Hiroshima became a designated city; as of August 2016, the city had an estimated population of 1,196,274. The gross domestic product in Greater Hiroshima, Hiroshima Urban Employment Area, was US$61.3 billion as of 2010. Kazumi Matsui has been the city's mayor since April 2011. Hiroshima was the first city targeted by a nuclear weapon, when the United States Army Air Forces dropped an atomic bomb on the city at 8:15 a.m. on August 6, 1945, near the end of World War II. Hiroshima was established on the delta coastline of the Seto Inland Sea in 1589 by powerful warlord Mōri Terumoto. Hiroshima Castle was built, in 1593 Mōri moved in. Terumoto was on the losing side at the Battle of Sekigahara; the winner of the battle, Tokugawa Ieyasu, deprived Mōri Terumoto of most of his fiefs, including Hiroshima and gave Aki Province to Masanori Fukushima, a daimyō who had supported Tokugawa.
From 1619 until 1871, Hiroshima was ruled by the Asano clan. After the Han was abolished in 1871, the city became the capital of Hiroshima Prefecture. Hiroshima became a major urban center during the imperial period, as the Japanese economy shifted from rural to urban industries. During the 1870s, one of the seven government-sponsored English language schools was established in Hiroshima. Ujina Harbor was constructed through the efforts of Hiroshima Governor Sadaaki Senda in the 1880s, allowing Hiroshima to become an important port city; the San'yō Railway was extended to Hiroshima in 1894, a rail line from the main station to the harbor was constructed for military transportation during the First Sino-Japanese War. During that war, the Japanese government moved temporarily to Hiroshima, Emperor Meiji maintained his headquarters at Hiroshima Castle from September 15, 1894, to April 27, 1895; the significance of Hiroshima for the Japanese government can be discerned from the fact that the first round of talks between Chinese and Japanese representatives to end the Sino-Japanese War was held in Hiroshima, from February 1 to February 4, 1895.
New industrial plants, including cotton mills, were established in Hiroshima in the late 19th century. Further industrialization in Hiroshima was stimulated during the Russo-Japanese War in 1904, which required development and production of military supplies; the Hiroshima Prefectural Commercial Exhibition Hall was constructed in 1915 as a center for trade and exhibition of new products. Its name was changed to Hiroshima Prefectural Product Exhibition Hall, again to Hiroshima Prefectural Industrial Promotion Hall. During World War I, Hiroshima became a focal point of military activity, as the Japanese government entered the war on the Allied side. About 500 German prisoners of war were held in Ninoshima Island in Hiroshima Bay; the growth of Hiroshima as a city continued after the First World War, as the city now attracted the attention of the Catholic Church, on May 4, 1923, an Apostolic Vicar was appointed for that city. During World War II, the Second General Army and Chūgoku Regional Army were headquartered in Hiroshima, the Army Marine Headquarters was located at Ujina port.
The city had large depots of military supplies, was a key center for shipping. The bombing of Tokyo and other cities in Japan during World War II caused widespread destruction and hundreds of thousands of civilian deaths. There were no such air raids on Hiroshima. However, a real threat was recognized. In order to protect against potential firebombings in Hiroshima, school children aged 11–14 years were mobilized to demolish houses and create firebreaks. On Monday, August 6, 1945, at 8:15 a.m. the nuclear weapon "Little Boy" was dropped on Hiroshima from an American Boeing B-29 Superfortress, the Enola Gay, flown by Colonel Paul Tibbets, directly killing an estimated 70,000 people, including 20,000 Japanese combatants and 2,000 Korean slave laborers. By the end of the year and radiation brought the total number of deaths to 90,000–166,000; the population before the bombing was around 340,000 to 350,000. About 70% of the city's buildings were destroyed, another 7% damaged; the public release of film footage of the city following the attack, some of the Atomic Bomb Casualty Commission research about the human effects of the attack, were restricted during the occupation of Japan, much of this information was censored until the signing of the Treaty of San Francisco in 1951, restoring control to the Japanese.
As Ian Buruma observed, "News of the terrible consequences of the atom bomb attacks on Japan was deliberately withheld from the Japanese public by US military censors during the Allied occupation—even as they sought to teach the natives the virtues of a free press. Casualty statistics were suppressed. Film shot by Japanese cameramen in Nagasaki after the bombings was confiscated. "Hiroshima", the account written by John Hersey for The New Yorker, had a huge impact in the US, but was banned in Japan. As Dower says:'In the localities themselves, suffering was compounded not by the unprecedented nature of the catastrophe... but by the fact that public struggle with this traumatic experience was not permitted." The US occupation authorities maintained a monopoly on scientific and medical information about the effects of the atomic bomb through the work of the Atomic Bomb Casualty Commission, which treated the data gathered in studies of hibakusha as privileged information rather than making the results available for the treatment of victims or providing financial or medical support to aid victims.
The book Hiroshima by
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or from a combination of fission and fusion reactions. Both bomb types release large quantities of energy from small amounts of matter; the first test of a fission bomb released an amount of energy equal to 20,000 tons of TNT. The first thermonuclear bomb test released energy equal to 10 million tons of TNT. A thermonuclear weapon weighing little more than 2,400 pounds can release energy equal to more than 1.2 million tons of TNT. A nuclear device no larger than traditional bombs can devastate an entire city by blast and radiation. Since they are weapons of mass destruction, the proliferation of nuclear weapons is a focus of international relations policy. Nuclear weapons have been used twice in war, both times by the United States against Japan near the end of World War II. On August 6, 1945, the U. S. Army Air Forces detonated a uranium gun-type fission bomb nicknamed "Little Boy" over the Japanese city of Hiroshima.
S. Army Air Forces detonated a plutonium implosion-type fission bomb nicknamed "Fat Man" over the Japanese city of Nagasaki; these bombings caused injuries that resulted in the deaths of 200,000 civilians and military personnel. The ethics of these bombings and their role in Japan's surrender are subjects of debate. Since the atomic bombings of Hiroshima and Nagasaki, nuclear weapons have been detonated over two thousand times for testing and demonstration. Only a few nations are suspected of seeking them; the only countries known to have detonated nuclear weapons—and acknowledge possessing them—are the United States, the Soviet Union, the United Kingdom, China, India and North Korea. Israel is believed to possess nuclear weapons, though, in a policy of deliberate ambiguity, it does not acknowledge having them. Germany, Turkey and the Netherlands are nuclear weapons sharing states. South Africa is the only country to have independently developed and renounced and dismantled its nuclear weapons.
The Treaty on the Non-Proliferation of Nuclear Weapons aims to reduce the spread of nuclear weapons, but its effectiveness has been questioned, political tensions remained high in the 1970s and 1980s. Modernisation of weapons continues to this day. There are two basic types of nuclear weapons: those that derive the majority of their energy from nuclear fission reactions alone, those that use fission reactions to begin nuclear fusion reactions that produce a large amount of the total energy output. All existing nuclear weapons derive some of their explosive energy from nuclear fission reactions. Weapons whose explosive output is from fission reactions are referred to as atomic bombs or atom bombs; this has long been noted as something of a misnomer, as their energy comes from the nucleus of the atom, just as it does with fusion weapons. In fission weapons, a mass of fissile material is forced into supercriticality—allowing an exponential growth of nuclear chain reactions—either by shooting one piece of sub-critical material into another or by compression of a sub-critical sphere or cylinder of fissile material using chemically-fueled explosive lenses.
The latter approach, the "implosion" method, is more sophisticated than the former. A major challenge in all nuclear weapon designs is to ensure that a significant fraction of the fuel is consumed before the weapon destroys itself; the amount of energy released by fission bombs can range from the equivalent of just under a ton to upwards of 500,000 tons of TNT. All fission reactions generate the remains of the split atomic nuclei. Many fission products are either radioactive or moderately radioactive, as such, they are a serious form of radioactive contamination. Fission products are the principal radioactive component of nuclear fallout. Another source of radioactivity is the burst of free neutrons produced by the weapon; when they collide with other nuclei in surrounding material, the neutrons transmute those nuclei into other isotopes, altering their stability and making them radioactive. The most used fissile materials for nuclear weapons applications have been uranium-235 and plutonium-239.
Less used has been uranium-233. Neptunium-237 and some isotopes of americium may be usable for nuclear explosives as well, but it is not clear that this has been implemented, their plausible use in nuclear weapons is a matter of dispute; the other basic type of nuclear weapon produces a large proportion of its energy in nuclear fusion reactions. Such fusion weapons are referred to as thermonuclear weapons or more colloquially as hydrogen bombs, as they rely on fusion reactions between isotopes of hydrogen. All such weapons derive a significant portion of their energy from fission reactions used to "trigger" fusion reactions, fusion reactions can themselves trigger additional fission reactions. Only six countries—United States, United Kingdom, China and India—have conducted thermonuclear weapon tests. North Korea claims to have tested a fusion weapon as of January 2016. Thermonuclear weapons a