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Large organizations that use Python include Wikipedia, Google, Yahoo!, CERN, NASA, Facebook, Amazon, Instagram, Spotify, and some smaller entities like ILM and ITA. The social news networking site Reddit was written mostly in Python.
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Python can serve as a scripting language for web applications, e.g., via for the Apache webserver. With Web Server Gateway Interface, a standard API has evolved to facilitate these applications. Web frameworks like Django, Pylons, Pyramid, TurboGears, web2py, Tornado, Flask, Bottle, and Zope support developers in the design and maintenance of complex applications. Pyjs and IronPython can be used to develop the client-side of Ajax-based applications. SQLAlchemy can be used as a data mapper to a relational database. Twisted is a framework to program communications between computers, and is used (for example) by Dropbox.
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Libraries such as NumPy, SciPy, and Matplotlib allow the effective use of Python in scientific computing, with specialized libraries such as Biopython and Astropy providing domain-specific functionality. SageMath is a computer algebra system with a notebook interface programmable in Python: its library covers many aspects of mathematics, including algebra, combinatorics, numerical mathematics, number theory, and calculus. OpenCV has Python bindings with a rich set of features for computer vision and image processing.
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Python is commonly used in artificial intelligence projects and machine learning projects with the help of libraries like TensorFlow, Keras, Pytorch, and scikit-learn. As a scripting language with a modular architecture, simple syntax, and rich text processing tools, Python is often used for natural language processing.
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Python has been successfully embedded in many software products as a scripting language, including in finite element method software such as Abaqus, 3D parametric modelers like FreeCAD, 3D animation packages such as 3ds Max, Blender, Cinema 4D, Lightwave, Houdini, Maya, modo, MotionBuilder, Softimage, the visual effects compositor Nuke, 2D imaging programs like GIMP, Inkscape, Scribus and Paint Shop Pro, and musical notation programs like scorewriter and capella. GNU Debugger uses Python as a pretty printer to show complex structures such as C++ containers. Esri promotes Python as the best choice for writing scripts in ArcGIS. It has also been used in several video games, and has been adopted as first of the three available programming languages in Google App Engine, the other two being Java and Go.
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Many operating systems include Python as a standard component. It ships with most Linux distributions, AmigaOS 4 (using Python 2.7), FreeBSD (as a package), NetBSD, and OpenBSD (as a package) and can be used from the command line (terminal). Many Linux distributions use installers written in Python: Ubuntu uses the Ubiquity installer, while Red Hat Linux and Fedora Linux use the Anaconda installer. Gentoo Linux uses Python in its package management system, Portage.
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Most of the Sugar software for the One Laptop per Child XO, developed at Sugar Labs since 2008, is written in Python. The Raspberry Pi single-board computer project has adopted Python as its main user-programming language.
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LibreOffice includes Python and intends to replace Java with Python. Its Python Scripting Provider is a core feature since Version 4.0 from 7 February 2013.
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Python's development practices have also been emulated by other languages. For example, the practice of requiring a document describing the rationale for, and issues surrounding, a change to the language (in Python, a PEP) is also used in Tcl, Erlang, and Swift.
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Avul Pakir Jainulabdeen Abdul Kalam (; 15 October 193127 July 2015) was an Indian aerospace scientist and statesman who served as the 11th President of India from 2002 to 2007. He was born and raised in Rameswaram, Tamil Nadu and studied physics and aerospace engineering. He spent the next four decades as a scientist and science administrator, mainly at the Defence Research and Development Organisation (DRDO) and Indian Space Research Organisation (ISRO) and was intimately involved in India's civilian space programme and military missile development efforts. He thus came to be known as the Missile Man of India for his work on the development of ballistic missile and launch vehicle technology. He also played a pivotal organisational, technical, and political role in India's "Pokhran-II" nuclear tests in 1998, the first since the original nuclear test by India in 1974.
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Kalam was elected as the 11th president of India in 2002 with the support of both the ruling Bharatiya Janata Party and the then-opposition Indian National Congress. Widely referred to as the "People's President", he returned to his civilian life of education, writing and public service after a single term. He was a recipient of several prestigious awards, including the Bharat Ratna, India's highest civilian honour.
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While delivering a lecture at the Indian Institute of Management Shillong, Kalam collapsed and died from an apparent cardiac arrest on 27 July 2015, aged 83. Thousands, including national-level dignitaries, attended the funeral ceremony held in his hometown of Rameswaram, where he was buried with full state honours.
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Avul Pakir Jainulabdeen Abdul Kalam was born on 15 October 1931, to a Tamil Muslim family in the pilgrimage centre of Rameswaram on Pamban Island, then in the Madras Presidency and now in the State of Tamil Nadu. His father Jainulabdeen Marakayar was a boat owner and imam of a local mosque; his mother Ashiamma was a housewife. His father owned a ferry that took Hindu pilgrims back and forth between Rameswaram and the now uninhabited Dhanushkodi. Kalam was the youngest of four brothers and one sister in his family. His ancestors had been wealthy Marakayar traders and landowners, with numerous properties and large tracts of land. Marakayar are a Muslim ethnic group found in coastal Tamil Nadu and Sri Lanka who claim descent from Arab traders and local women. The family business had involved trading groceries between the mainland and the island and to and from Sri Lanka, as well as ferrying pilgrims between the mainland and Pamban. With the opening of the Pamban Bridge to the mainland in 1914, however, the businesses failed and the family fortune and properties were lost by the 1920s, apart from the ancestral home. The family was poverty-stricken by the time Kalam was born. As a young boy he had to sell newspapers to add to the family's meager income.
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In his school years, Kalam had average grades but was described as a bright and hardworking student who had a strong desire to learn. He spent hours on his studies, especially mathematics. After completing his education at the Schwartz Higher Secondary School, Ramanathapuram, Kalam went on to attend Saint Joseph's College, Tiruchirappalli, then affiliated with the University of Madras, from where he graduated in physics in 1954.
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He moved to Madras in 1955 to study aerospace engineering in Madras Institute of Technology. While Kalam was working on a senior class project, the Dean was dissatisfied with his lack of progress and threatened to revoke his scholarship unless the project was finished within the next three days. Kalam met the deadline, impressing the Dean, who later said to him, "I was putting you under stress and asking you to meet a difficult deadline." He narrowly missed achieving his dream of becoming a fighter pilot, as he placed ninth in qualifiers, and only eight positions were available in the IAF.
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After graduating from the Madras Institute of Technology in 1960, Kalam joined the Aeronautical Development Establishment of the Defence Research and Development Organisation (by Press Information Bureau, Government of India) as a scientist after becoming a member of the Defence Research & Development Service (DRDS). He started his career by designing a small hovercraft, but remained unconvinced by his choice of a job at DRDO. Kalam was also part of the INCOSPAR committee working under Vikram Sarabhai, the renowned space scientist. In 1969, Kalam was transferred to the Indian Space Research Organisation (ISRO) where he was the project director of India's first Satellite Launch Vehicle (SLV-III) which successfully deployed the "Rohini" satellite in near-earth orbit in July 1980; Kalam had first started work on an expandable rocket project independently at DRDO in 1965. In 1969, Kalam received the government's approval and expanded the programme to include more engineers.
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In 1963 to 1964, he visited NASA's Langley Research Center in Hampton, Virginia; Goddard Space Flight Center in Greenbelt, Maryland; and Wallops Flight Facility. Between the 1970s and 1990s, Kalam made an effort to develop the Polar Satellite Launch Vehicle (PSLV) and SLV-III projects, both of which proved to be successful.
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Kalam was invited by Raja Ramanna to witness the country's first nuclear test Smiling Buddha as the representative of TBRL, even though he had not participated in its development. In the 1970s, Kalam also directed two projects, "Project Devil" and "Project Valiant", which sought to develop ballistic missiles from the technology of the successful SLV programme. Despite the disapproval of the Union Cabinet, Prime Minister Indira Gandhi allotted secret funds for these aerospace projects through her discretionary powers under Kalam's directorship. Kalam played an integral role convincing the Union Cabinet to conceal the true nature of these classified aerospace projects.
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His research and educational leadership brought him great laurels and prestige in the 1980s, which prompted the government to initiate an advanced missile programme under his directorship. Kalam and Dr V S Arunachalam, metallurgist and scientific adviser to the Defence Minister, worked on the suggestion by the then Defence Minister, R. Venkataraman on a proposal for simultaneous development of a quiver of missiles instead of taking planned missiles one after another. R Venkatraman was instrumental in getting the cabinet approval for allocating 3.88 billion for the mission, named Integrated Guided Missile Development Programme (IGMDP) and appointed Kalam as the chief executive. Kalam played a major part in developing many missiles under the mission including Agni, an intermediate range ballistic missile and Prithvi, the tactical surface-to-surface missile, although the projects have been criticised for mismanagement and cost and time overruns.
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Kalam served as the Chief Scientific Adviser to the Prime Minister and Secretary of the Defence Research and Development Organisation from July 1992 to December 1999. The "Pokhran-II" nuclear tests were conducted during this period in which he played an intensive political and technological role. Kalam served as the Chief Project Coordinator, along with Rajagopala Chidambaram, during the testing phase. Media coverage of Kalam during this period made him the country's best known nuclear scientist. However, the director of the site test, K Santhanam, said that the thermonuclear bomb had been a "fizzle" and criticised Kalam for issuing an incorrect report. Both Kalam and Chidambaram dismissed the claims.
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In 1998, along with cardiologist Soma Raju, Kalam developed a low cost coronary stent, named the "Kalam-Raju Stent". In 2012, the duo designed a rugged tablet computer for health care in rural areas, which was named the "Kalam-Raju Tablet".
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Kalam served as the 11th president of India, succeeding K. R. Narayanan. He won the 2002 presidential election with an electoral vote of 922,884, surpassing the 107,366 votes won by Lakshmi Sahgal. His term lasted from 25 July 2002, to 25 July 2007.
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On 10 June 2002, the National Democratic Alliance (NDA) which was in power at the time, expressed that they would nominate Kalam for the post of President, and both the Samajwadi Party and the Nationalist Congress Party backed his candidacy. After the Samajwadi Party announced its support for Kalam, Narayanan chose not to seek a second term in office, leaving the field clear. Kalam said of the announcement of his candidature:
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On 18 June, Kalam filed his nomination papers in the Indian Parliament, accompanied by Vajpayee and his senior Cabinet colleagues.
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The polling for the presidential election began on 15 July 2002, in Parliament and the state assemblies, with the media claiming that the election was a one-sided affair and Kalam's victory was a foregone conclusion; the count was held on 18 July. Kalam became the 11th president of the Republic of India in an easy victory, and moved into the Rashtrapati Bhavan after he was sworn in on 25 July. Kalam was the third President of India to have been honoured with a Bharat Ratna, India's highest civilian honour, before becoming the President Sarvepalli Radhakrishnan (1954) and Zakir Hussain (1963) were the earlier recipients of Bharat Ratna who later became the President of India. He was also the first scientist and the first bachelor to occupy Rashtrapati Bhawan.
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During his term as president, he was affectionately known as the "People's President", saying that signing the Office of Profit Bill was the toughest decision he had taken during his tenure. Kalam was criticised for his inaction in deciding the fate of 20 out of the 21 mercy petitions submitted to him during his tenure. Article 72 of the Constitution of India empowers the President of India to grant pardons, and suspend or commute the death sentence of convicts on death row. Kalam acted on only one mercy plea in his five-year tenure as president, rejecting the plea of rapist Dhananjoy Chatterjee, who was later hanged. Perhaps the most notable plea was from Afzal Guru, a Kashmiri terrorist who was convicted of conspiracy in the December 2001 attack on the Indian Parliament and was sentenced to death by the Supreme Court of India in 2004. While the sentence was scheduled to be carried out on 20 October 2006, the pending action on his mercy plea resulted in him remaining on death row. He also took the controversial decision to impose President's Rule in Bihar in 2005.
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In September 2003, in an interactive session in PGI Chandigarh, Kalam supported the need of Uniform Civil Code in India, keeping in view the population of the country.
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At the end of his term, on 20 June 2007, Kalam expressed his willingness to consider a second term in office provided there was certainty about his victory in the 2007 presidential election. However, two days later, he decided not to contest the Presidential election again stating that he wanted to avoid involving Rashtrapati Bhavan from any political processes. He Was prosped by third front named "United National Progressive Alliance" leader J. Jayalalithaa and coordinator Chandrababu Naidu other leaders Mulayam Singh Yadav and Om Prakash Chautala,But He did not have the support of the left parties, Shiv Sena and UPA constituents, to receive a renewed mandate.
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Nearing the expiry of the term of the 12th President Pratibha Patil on 24 July 2012, media reports in April claimed that Kalam was likely to be nominated for his second term. After the reports, social networking sites witnessed a number of people supporting his candidature. The BJP potentially backed his nomination, saying that the party would lend their support if the Trinamool Congress, Samajwadi Party and Indian National Congress proposed him for the 2012 presidential election. A month ahead of the election, Mulayam Singh Yadav and Mamata Banerjee also expressed their support for Kalam. Days afterwards, Mulayam Singh Yadav backed out, leaving Mamata Banerjee as the solitary supporter. On 18 June 2012, Kalam declined to contest the 2012 presidential poll. He said of his decision not to do so:
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After leaving office, Kalam became a visiting professor at the Indian Institute of Management Shillong, the Indian Institute of Management Ahmedabad, and the Indian Institute of Management Indore; an honorary fellow of Indian Institute of Science, Bangalore; chancellor of the Indian Institute of Space Science and Technology Thiruvananthapuram; professor of Aerospace Engineering at Anna University; and an adjunct at many other academic and research institutions across India. He taught information technology at the International Institute of Information Technology, Hyderabad, and technology at Banaras Hindu University and Anna University.
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In 2011, Kalam was criticised by civil groups over his stand on the Koodankulam Nuclear Power Plant; he supported the establishment of the nuclear power plant and was accused of not speaking with the local people. The protesters were hostile to his visit as they saw him as a pro-nuclear scientist and were unimpressed by the assurances he provided regarding the safety features of the plant.
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In May 2012, Kalam launched a programme for the youth of India called the "What Can I Give Movement", with a central theme of defeating corruption.
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On 27 July 2015, Kalam travelled to Shillong to deliver a lecture on "Creating a Livable Planet Earth" at the Indian Institute of Management Shillong. While climbing a flight of stairs, he experienced some discomfort, but was able to enter the auditorium after a brief rest. At around 6:35 p.m. IST, only five minutes into his lecture, he collapsed. He was rushed to the nearby Bethany Hospital in a critical condition; upon arrival, he lacked a pulse or any other signs of life. Despite being placed in the intensive care unit, Kalam was confirmed dead of a sudden cardiac arrest at 7:45p.m. IST. His last words, to his aide Srijan Pal Singh, were reportedly: "Funny guy! Are you doing well?"
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Following his death, Kalam's body was airlifted in an Indian Air Force helicopter from Shillong to Guwahati, from where it was flown to New Delhi on the morning of 28 July in an air force C-130J Hercules. The flight landed at Palam Air Base that afternoon and was received by the President, the vice-president, the Prime Minister, Chief Minister of Delhi Arvind Kejriwal, and the three service chiefs of the Indian Armed Forces, who laid wreaths on Kalam's body. His body was then placed on a gun carriage draped with the Indian flag and taken to his Delhi residence at 10 Rajaji Marg; there, the public and numerous dignitaries paid homage, including former prime minister Manmohan Singh, Congress President Sonia Gandhi and Vice-president Rahul Gandhi, and Uttar Pradesh Chief Minister Akhilesh Yadav.
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On the morning of 29 July, Kalam's body, wrapped in the Indian flag, was taken to Palam Air Base and flown to Madurai in an air force C-130J aircraft, arriving at Madurai Airport that afternoon. His body was received at the airport by the three service chiefs and national and state dignitaries, including cabinet ministers Manohar Parrikar, Venkaiah Naidu, Pon Radhakrishnan and the governors of Tamil Nadu and Meghalaya, K Rosaiah and V. Shanmuganathan. After a brief ceremony, Kalam's body was flown by air force helicopter to the town of Mandapam, from where it was taken in an army truck to his hometown of Rameswaram. Upon arriving at Rameswaram, his body was displayed in an open area in front of the local bus station to allow the public to pay their final respects until 8p.m. that evening.
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On 30 July 2015, the former president was laid to rest at Rameswaram's Pei Karumbu Ground with full state honours. Over 350,000 people attended the last rites, including the Prime Minister, the governor of Tamil Nadu and the chief ministers of Karnataka, Kerala and Andhra Pradesh.
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India reacted to Kalam's death with an outpouring of grief; numerous tributes were paid to the former president across the nation and on social media. The Government of India declared a seven-day state mourning period as a mark of respect. President Pranab Mukherjee, Vice-president Hamid Ansari, Home Minister Rajnath Singh, and other leaders condoled the former President's demise. Prime Minister Narendra Modi said "Kalam's death is a great loss to the scientific community. He took India to great heights. He showed the way." Former Prime Minister Dr Manmohan Singh, who had served as prime minister under Kalam, said, "our country has lost a great human being who made phenomenal contributions to the promotion of self-reliance in defence technologies. I worked very closely with Dr. Kalam as prime minister and I greatly benefited from his advice as president of our country. His life and work will be remembered for generations to come." ISRO chairman A. S. Kiran Kumar called his former colleague "a great personality and a gentleman", while former chairman G. Madhavan Nair described Kalam as "a global leader" for whom "the downtrodden and poor people were his priority. He always had a passion to convey what is in his mind to the young generation", adding that his death left a vacuum which none could fill.
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South Asian leaders expressed condolences and lauded the late statesman. The Bhutanese government ordered the country's flags to fly at half-staff to mourn Kalam's death and lit 1000 butter lamps in homage. Bhutanese Prime Minister Tshering Tobgay expressed deep sadness, saying Kalam "was a leader greatly admired by all people, especially the youth of India who have referred to him as the people's President". Bangladesh Prime Minister Sheikh Hasina described Kalam as "a rare combination of a great statesman, acclaimed scientist, and a source of inspiration to the young generation of South Asia" and termed his death an "irreparable loss to India and beyond". Bangladesh Nationalist Party chief Khaleda Zia said "as a nuclear scientist, he engaged himself in the welfare of the people". Ashraf Ghani, the President of Afghanistan, called Kalam "an inspirational figure to millions of people," noting that "we have a lot to learn from his life". Nepalese Prime Minister Sushil Koirala recalled Kalam's scientific contributions to India: "Nepal has lost a good friend and I have lost an honoured and ideal personality." The President of Pakistan, Mamnoon Hussain, and Prime Minister of Pakistan Nawaz Sharif also expressed their grief and condolences on his death. The President of Sri Lanka, Maithripala Sirisena, also expressed his condolences. "Dr. Kalam was a man of firm conviction and indomitable spirit, and I saw him as an outstanding statesman of the world. His death is an irreparable loss not only to India but to the entire world." Maldivian President Abdulla Yameen and Vice-president Ahmed Adeeb condoled Kalam's death, with Yameen naming him as a close friend of the Maldives who would continue to be an inspiration to Indians and generations of South Asians. Former President Maumoon Abdul Gayoom, who had made an official visit to India during Kalam's presidency, termed his demise as a great loss to all of humankind. The Commander-in-Chief of the Myanmar Armed Forces, Senior General Min Aung Hlaing, expressed condolences on behalf of the Myanmar government. The Dalai Lama expressed his sadness and offered condolences and prayers, calling Kalam's death "an irreparable loss".
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Kathleen Wynne, the Premier of Ontario, which Kalam had visited on numerous occasions, expressed "deepest condolences ... as a respected scientist, he played a critical role in the development of the Indian space programme. As a committed educator, he inspired millions of young people to achieve their very best. And as a devoted leader, he gained support both at home and abroad, becoming known as 'the people's President'. I join our IndoCanadian families, friends, and neighbours in mourning the passing of this respected leader." United States President Barack Obama extended "deepest condolences to the people of India on the passing of former Indian President Dr. APJ Abdul Kalam", and highlighted his achievements as a scientist and as a statesman, notably his role in strengthening US–India relations and increasing space co-operation between the two nations. "Suitably named 'the People's President', Dr. Kalam's humility and dedication to public service served as an inspiration to millions of Indians and admirers around the world."
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Russian President Vladimir Putin expressed sincere condolences and conveyed his sympathy and support "to the near and dear ones of the deceased leader, to the government, and entire people of India". He remarked on Kalam's outstanding "personal contribution to the social, economic, scientific, and technical progress of India and in ensuring its national security," adding that Kalam would be remembered as a "consistent exponent of closer friendly relations between our nations, who has done a lot for cementing mutually beneficial RussianIndian cooperation." Other international leaders—including former Indonesian president Susilo Bambang Yudhoyono, Malaysian Prime Minister Najib Razak, Singaporean Prime Minister Lee Hsien Loong, President of the United Arab Emirates Sheikh Khalifa bin Zayed Al Nahyan, and vice-president and Prime Minister of the United Arab Emirates and emir of Dubai Sheikh Mohammed bin Rashid Al Maktoum—also paid tribute to Kalam. In a special gesture, Secretary-General of the United Nations Ban Ki-moon visited the Permanent Mission of India to the UN and signed a condolence book. "The outpouring of grief around the world is a testament of the respect and inspiration he has garnered during and after his presidency. The UN joins the people of India in sending our deepest condolences for this great statesman. May he rest in peace and eternity", Ban wrote in his message.
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The Dr. A. P. J. Abdul Kalam National Memorial was built in memory of Kalam by the DRDO in Pei Karumbu, in the island town of Rameswaram, Tamil Nadu. It was inaugurated by Prime Minister Narendra Modi in July 2017. On display are the replicas of rockets and missiles which Kalam had worked with. Acrylic paintings about his life are also displayed along with hundreds of portraits depicting the life of the mass leader. There is a statue of Kalam in the entrance showing him playing the Veena. There are two other smaller statues of the leader in sitting and standing posture.
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Kalam was the youngest of five siblings, the eldest of whom was a sister, Asim Zohra (), followed by three elder brothers: Mohammed Muthu Meera Lebbai Maraikayar (5 November 1916 – 7 March 2021), Mustafa Kalam () and Kasim Mohammed (). He was extremely close to his elder siblings and their extended families throughout his life, and would regularly send small sums of money to his older relations, himself remaining a lifelong bachelor.
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Kalam was noted for his integrity and his simple lifestyle. He never owned a television, and was in the habit of rising at 6:30 or 7a.m. and sleeping by 2a.m. His few personal possessions included his books, his veena, some articles of clothing, a CD player and a laptop; at his death, he left no will, and his possessions went to his eldest brother, who survived him.
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Religion and spirituality were very important to Kalam throughout his life. He made his own spiritual journey the subject of his final book, "".
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A proud and practising Muslim, daily namaz and fasting during Ramadan were integral to Kalam's life. His father, the imam of a mosque in his hometown of Rameswaram, had strictly instilled these Islamic customs in his children. His father had also impressed upon the young Kalam the value of interfaith respect and dialogue. As Kalam recalled: "Every evening, my father A. P. Jainulabdeen, an imam, Pakshi Lakshmana Sastry, the head priest of the Ramanathaswamy Hindu temple, and a church priest used to sit with hot tea and discuss the issues concerning the island." Such early exposure convinced Kalam that the answers to India's multitudinous issues lay in "dialogue and cooperation" among the country's religious, social, and political leaders. Moreover, since Kalam believed that "respect for other faiths" was one of the key cornerstones of Islam, he was fond of saying: "For great men, religion is a way of making friends; small people make religion a fighting tool."
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One component of Kalam's widespread popularity among diverse groups in India, and an enduring aspect of his legacy, is the syncretism he embodied in appreciating various elements of the many spiritual and cultural traditions of India. In addition to his faith in the Quran and Islamic practice, Kalam was well-versed in Hindu traditions; he learnt Sanskrit, read the Bhagavad Gita and he was a vegetarian. Kalam also enjoyed writing Tamil poetry, playing the veena (an Indian string instrument), and listening to Carnatic devotional music every day. In 2002, in one of his early speeches to Parliament after becoming president, he reiterated his desire for a more united India, stating that "during the last one year I met a number of spiritual leaders of all religions ... and I would like to endeavour to work for bringing about unity of minds among the divergent traditions of our country". Describing Kalam as a unifier of diverse traditions, Congress leader Shashi Tharoor stated, "Kalam was a complete Indian, an embodiment of the eclecticism of India's heritage of diversity". BJP leader L. K. Advani concurred that Kalam was "the best exemplar of the Idea of India, one who embodied the best of all the cultural and spiritual traditions that signify India's unity in immense diversity. This was most strikingly evident in the second-to-last book he published, presciently titled """.
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Kalam's desire to meet spiritual leaders to help create a more prosperous, spiritual, and unified India was what initially led him to meet Pramukh Swami, the Hindu guru of the BAPS Swaminarayan Sampradaya, who Kalam would come to consider his ultimate spiritual teacher and guru. The first of eight meetings between Kalam and Pramukh Swami over a fourteen-year period took place on 30 June 2001, in New Delhi, during which Kalam described being immediately drawn to Pramukh Swami's simplicity and spiritual purity. Kalam stated that he was inspired by Pramukh Swami throughout their numerous interactions. One such incident occurred the day following the terrorist attack on BAPS' Akshardham, Gandhinagar complex in September 2002; Pramukh Swami prayed for, and sprinkled holy water upon, the sites of all of the deceased, including the terrorists, demonstrating the view that all human life is sacred. Kalam recalled being moved by Pramukh Swami's equanimity and compassion, citing this incident as one of his motivations for writing "". Summarising the effect that Pramukh Swami had on him, Kalam stated that "[Pramukh Swami] has indeed transformed me. He is the ultimate stage of the spiritual ascent in my life ... Pramukh Swamiji has put me in a God-synchronous orbit. No manoeuvres are required any more, as I am placed in my final position in eternity." Following Kalam's death a month after his final book was released, co-author Arun Tiwari pointed to this passage as potentially prophetic and premonitory of Kalam's death.
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In his book "India 2020", Kalam strongly advocated an action plan to develop India into a "knowledge superpower" and a developed nation by 2020. He regarded his work on India's nuclear weapons programme as a way to assert India's place as a future superpower.
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Kalam describes a "transformative moment" in his life when he asked Pramukh Swami, the guru of the BAPS Swaminarayan Sampradaya, how India might realise this five-pronged vision of development. Pramukh Swami's answer—to add a sixth area developing faith in God and spirituality to overcome the current climate of crime and corruption—became the spiritual vision for the next 15 years Kalam's life, which he describes in his final book, "," published just a month before his death.
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It was reported that there was considerable demand in South Korea for translated versions of books authored by him.
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Kalam took an active interest in other developments in the field of science and technology, including a research programme for developing biomedical implants. He also supported open source technology over proprietary software, predicting that the use of free software on a large scale would bring the benefits of information technology to more people.
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Kalam set a target of interacting with 100,000 students during the two years after his resignation from the post of scientific adviser in 1999. He explained, "I feel comfortable in the company of young people, particularly high school students. Henceforth, I intend to share with them experiences, helping them to ignite their imagination and preparing them to work for a developed India for which the road map is already available." His dream is to let every student to light up the sky with victory using their latent fire in the heart.
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Kalam received 7 honorary doctorates from 40 universities. The Government of India honoured him with the Padma Bhushan in 1981 and the Padma Vibhushan in 1990 for his work with ISRO and DRDO and his role as a scientific advisor to the Government. In 1997, Kalam received India's highest civilian honour, the Bharat Ratna, for his contribution to the scientific research and modernisation of defence technology in India. In 2013, he was the recipient of the Von Braun Award from the National Space Society "to recognize excellence in the management and leadership of a space-related project".
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Following his death, Kalam received numerous tributes. The Tamil Nadu state government announced that his birthday, 15 October, would be observed across the state as "Youth Renaissance Day;" the state government further instituted the "Dr. A. P. J. Abdul Kalam Award", constituting an 8-gram gold medal, a certificate and . The award will be awarded annually on Independence Day, beginning in 2015, to residents of the state with achievements in promoting scientific growth, the humanities or the welfare of students.
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On the anniversary of Kalam's birth in 2015 the CBSE set topics on his name in the CBSE expression series.
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Prime Minister Narendra Modi ceremonially released postage stamps commemorating Kalam at DRDO Bhawan in New Delhi on 15 October 2015, the 84th anniversary of Kalam's birth.
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Researchers at the NASA's Jet Propulsion Laboratory (JPL) had discovered a new bacterium on the filters of the International Space Station (ISS) and named it "Solibacillus kalamii" to honour the late president Dr. A. P. J. Abdul Kalam.
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Several educational and scientific institutions and other locations were renamed or named in honour of Kalam following his death.
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Wheeler Island, a national missile test site in Odisha, was renamed Abdul Kalam Island in September 2015.
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A prominent road in New Delhi was renamed from Aurangzeb Road to Dr APJ Abdul Kalam Road in August 2015.
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In February 2018, scientists from the Botanical Survey of India named a newly found plant species as "Drypetes kalamii", in his honour.
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A computer is a digital electronic machine that can be programmed to carry out sequences of arithmetic or logical operations (computation) automatically. Modern computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks. A computer system is a nominally complete computer that includes the hardware, operating system (main software), and peripheral equipment needed and used for full operation. This term may also refer to a group of computers that are linked and function together, such as a computer network or computer cluster.
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A broad range of industrial and consumer products use computers as control systems. Simple special-purpose devices like microwave ovens and remote controls are included, as are factory devices like industrial robots and computer-aided design, as well as general-purpose devices like personal computers and mobile devices like smartphones. Computers power the Internet, which links billions of other computers and users.
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Early computers were meant to be used only for calculations. Simple manual instruments like the abacus have aided people in doing calculations since ancient times. Early in the Industrial Revolution, some mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms. More sophisticated electrical machines did specialized analog calculations in the early 20th century. The first digital electronic calculating machines were developed during World War II. The first semiconductor transistors in the late 1940s were followed by the silicon-based MOSFET (MOS transistor) and monolithic integrated circuit (IC) chip technologies in the late 1950s, leading to the microprocessor and the microcomputer revolution in the 1970s. The speed, power and versatility of computers have been increasing dramatically ever since then, with transistor counts increasing at a rapid pace (as predicted by Moore's law), leading to the Digital Revolution during the late 20th to early 21st centuries.
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Conventionally, a modern computer consists of at least one processing element, typically a central processing unit (CPU) in the form of a microprocessor, along with some type of computer memory, typically semiconductor memory chips. The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response to stored information. Peripheral devices include input devices (keyboards, mice, joystick, etc.), output devices (monitor screens, printers, etc.), and input/output devices that perform both functions (e.g., the 2000s-era touchscreen). Peripheral devices allow information to be retrieved from an external source and they enable the result of operations to be saved and retrieved.
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According to the "Oxford English Dictionary", the first known use of "computer" was in a 1613 book called "The Yong Mans Gleanings" by the English writer Richard Brathwait: "I haue read the truest computer of Times, and the best Arithmetician that euer breathed, and he reduceth thy dayes into a short number." This usage of the term referred to a human computer, a person who carried out calculations or computations. The word continued with the same meaning until the middle of the 20th century. During the latter part of this period women were often hired as computers because they could be paid less than their male counterparts. By 1943, most human computers were women.
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The "Online Etymology Dictionary" gives the first attested use of "computer" in the 1640s, meaning 'one who calculates'; this is an "agent noun from compute (v.)". The "Online Etymology Dictionary" states that the use of the term to mean calculating machine' (of any type) is from 1897." The "Online Etymology Dictionary" indicates that the "modern use" of the term, to mean 'programmable digital electronic computer' dates from "1945 under this name; [in a] theoretical [sense] from 1937, as "Turing machine"".
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Devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers. The earliest counting device was most likely a form of tally stick. Later record keeping aids throughout the Fertile Crescent included calculi (clay spheres, cones, etc.) which represented counts of items, likely livestock or grains, sealed in hollow unbaked clay containers. The use of counting rods is one example.
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The abacus was initially used for arithmetic tasks. The Roman abacus was developed from devices used in Babylonia as early as 2400 BC. Since then, many other forms of reckoning boards or tables have been invented. In a medieval European counting house, a checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.
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The Antikythera mechanism is believed to be the earliest known mechanical analog computer, according to Derek J. de Solla Price. It was designed to calculate astronomical positions. It was discovered in 1901 in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to approximately . Devices of comparable complexity to the Antikythera mechanism would not reappear until the fourteenth century.
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Many mechanical aids to calculation and measurement were constructed for astronomical and navigation use. The planisphere was a star chart invented by Abū Rayhān al-Bīrūnī in the early 11th century. The astrolabe was invented in the Hellenistic world in either the 1st or 2nd centuries BC and is often attributed to Hipparchus. A combination of the planisphere and dioptra, the astrolabe was effectively an analog computer capable of working out several different kinds of problems in spherical astronomy. An astrolabe incorporating a mechanical calendar computer and gear-wheels was invented by Abi Bakr of Isfahan, Persia in 1235. Abū Rayhān al-Bīrūnī invented the first mechanical geared lunisolar calendar astrolabe, an early fixed-wired knowledge processing machine with a gear train and gear-wheels, .
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The sector, a calculating instrument used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots, was developed in the late 16th century and found application in gunnery, surveying and navigation.
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The planimeter was a manual instrument to calculate the area of a closed figure by tracing over it with a mechanical linkage.
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The slide rule was invented around 1620–1630 by the English clergyman William Oughtred, shortly after the publication of the concept of the logarithm. It is a hand-operated analog computer for doing multiplication and division. As slide rule development progressed, added scales provided reciprocals, squares and square roots, cubes and cube roots, as well as transcendental functions such as logarithms and exponentials, circular and hyperbolic trigonometry and other functions. Slide rules with special scales are still used for quick performance of routine calculations, such as the E6B circular slide rule used for time and distance calculations on light aircraft.
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In the 1770s, Pierre Jaquet-Droz, a Swiss watchmaker, built a mechanical doll (automaton) that could write holding a quill pen. By switching the number and order of its internal wheels different letters, and hence different messages, could be produced. In effect, it could be mechanically "programmed" to read instructions. Along with two other complex machines, the doll is at the Musée d'Art et d'Histoire of Neuchâtel, Switzerland, and still operates.
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In 1831–1835, mathematician and engineer Giovanni Plana devised a Perpetual Calendar machine, which, through a system of pulleys and cylinders and over, could predict the perpetual calendar for every year from AD 0 (that is, 1 BC) to AD 4000, keeping track of leap years and varying day length. The tide-predicting machine invented by the Scottish scientist Sir William Thomson in 1872 was of great utility to navigation in shallow waters. It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location.
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The differential analyser, a mechanical analog computer designed to solve differential equations by integration, used wheel-and-disc mechanisms to perform the integration. In 1876, Sir William Thomson had already discussed the possible construction of such calculators, but he had been stymied by the limited output torque of the ball-and-disk integrators. In a differential analyzer, the output of one integrator drove the input of the next integrator, or a graphing output. The torque amplifier was the advance that allowed these machines to work. Starting in the 1920s, Vannevar Bush and others developed mechanical differential analyzers.
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Charles Babbage, an English mechanical engineer and polymath, originated the concept of a programmable computer. Considered the "father of the computer", he conceptualized and invented the first mechanical computer in the early 19th century. After working on his revolutionary difference engine, designed to aid in navigational calculations, in 1833 he realized that a much more general design, an Analytical Engine, was possible. The input of programs and data was to be provided to the machine via punched cards, a method being used at the time to direct mechanical looms such as the Jacquard loom. For output, the machine would have a printer, a curve plotter and a bell. The machine would also be able to punch numbers onto cards to be read in later. The Engine incorporated an arithmetic logic unit, control flow in the form of conditional branching and loops, and integrated memory, making it the first design for a general-purpose computer that could be described in modern terms as Turing-complete.
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The machine was about a century ahead of its time. All the parts for his machine had to be made by hand – this was a major problem for a device with thousands of parts. Eventually, the project was dissolved with the decision of the British Government to cease funding. Babbage's failure to complete the analytical engine can be chiefly attributed to political and financial difficulties as well as his desire to develop an increasingly sophisticated computer and to move ahead faster than anyone else could follow. Nevertheless, his son, Henry Babbage, completed a simplified version of the analytical engine's computing unit (the "mill") in 1888. He gave a successful demonstration of its use in computing tables in 1906.
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During the first half of the 20th century, many scientific computing needs were met by increasingly sophisticated analog computers, which used a direct mechanical or electrical model of the problem as a basis for computation. However, these were not programmable and generally lacked the versatility and accuracy of modern digital computers. The first modern analog computer was a tide-predicting machine, invented by Sir William Thomson (later to become Lord Kelvin) in 1872. The differential analyser, a mechanical analog computer designed to solve differential equations by integration using wheel-and-disc mechanisms, was conceptualized in 1876 by James Thomson, the elder brother of the more famous Sir William Thomson.
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The art of mechanical analog computing reached its zenith with the differential analyzer, built by H. L. Hazen and Vannevar Bush at MIT starting in 1927. This built on the mechanical integrators of James Thomson and the torque amplifiers invented by H. W. Nieman. A dozen of these devices were built before their obsolescence became obvious. By the 1950s, the success of digital electronic computers had spelled the end for most analog computing machines, but analog computers remained in use during the 1950s in some specialized applications such as education (slide rule) and aircraft (control systems).
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By 1938, the United States Navy had developed an electromechanical analog computer small enough to use aboard a submarine. This was the Torpedo Data Computer, which used trigonometry to solve the problem of firing a torpedo at a moving target. During World War II similar devices were developed in other countries as well.
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Early digital computers were electromechanical; electric switches drove mechanical relays to perform the calculation. These devices had a low operating speed and were eventually superseded by much faster all-electric computers, originally using vacuum tubes. The Z2, created by German engineer Konrad Zuse in 1939, was one of the earliest examples of an electromechanical relay computer.
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In 1941, Zuse followed his earlier machine up with the Z3, the world's first working electromechanical programmable, fully automatic digital computer. The Z3 was built with 2000 relays, implementing a 22 bit word length that operated at a clock frequency of about 5–10 Hz. Program code was supplied on punched film while data could be stored in 64 words of memory or supplied from the keyboard. It was quite similar to modern machines in some respects, pioneering numerous advances such as floating-point numbers. Rather than the harder-to-implement decimal system (used in Charles Babbage's earlier design), using a binary system meant that Zuse's machines were easier to build and potentially more reliable, given the technologies available at that time. The Z3 was not itself a universal computer but could be extended to be Turing complete.
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Zuse's next computer, the Z4, became the world's first commercial computer; after initial delay due to the Second World War, it was completed in 1950 and delivered to the ETH Zurich. The computer was manufactured by Zuse's own company, , which was founded in 1941 as the first company with the sole purpose of developing computers.
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Purely electronic circuit elements soon replaced their mechanical and electromechanical equivalents, at the same time that digital calculation replaced analog. The engineer Tommy Flowers, working at the Post Office Research Station in London in the 1930s, began to explore the possible use of electronics for the telephone exchange. Experimental equipment that he built in 1934 went into operation five years later, converting a portion of the telephone exchange network into an electronic data processing system, using thousands of vacuum tubes. In the US, John Vincent Atanasoff and Clifford E. Berry of Iowa State University developed and tested the Atanasoff–Berry Computer (ABC) in 1942, the first "automatic electronic digital computer". This design was also all-electronic and used about 300 vacuum tubes, with capacitors fixed in a mechanically rotating drum for memory.
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During World War II, the British code-breakers at Bletchley Park achieved a number of successes at breaking encrypted German military communications. The German encryption machine, Enigma, was first attacked with the help of the electro-mechanical bombes which were often run by women. To crack the more sophisticated German Lorenz SZ 40/42 machine, used for high-level Army communications, Max Newman and his colleagues commissioned Flowers to build the Colossus. He spent eleven months from early February 1943 designing and building the first Colossus. After a functional test in December 1943, Colossus was shipped to Bletchley Park, where it was delivered on 18 January 1944 and attacked its first message on 5 February.
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Colossus was the world's first electronic digital programmable computer. It used a large number of valves (vacuum tubes). It had paper-tape input and was capable of being configured to perform a variety of boolean logical operations on its data, but it was not Turing-complete. Nine Mk II Colossi were built (The Mk I was converted to a Mk II making ten machines in total). Colossus Mark I contained 1,500 thermionic valves (tubes), but Mark II with 2,400 valves, was both five times faster and simpler to operate than Mark I, greatly speeding the decoding process.
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The ENIAC (Electronic Numerical Integrator and Computer) was the first electronic programmable computer built in the U.S. Although the ENIAC was similar to the Colossus, it was much faster, more flexible, and it was Turing-complete. Like the Colossus, a "program" on the ENIAC was defined by the states of its patch cables and switches, a far cry from the stored program electronic machines that came later. Once a program was written, it had to be mechanically set into the machine with manual resetting of plugs and switches. The programmers of the ENIAC were six women, often known collectively as the "ENIAC girls".
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It combined the high speed of electronics with the ability to be programmed for many complex problems. It could add or subtract 5000 times a second, a thousand times faster than any other machine. It also had modules to multiply, divide, and square root. High speed memory was limited to 20 words (about 80 bytes). Built under the direction of John Mauchly and J. Presper Eckert at the University of Pennsylvania, ENIAC's development and construction lasted from 1943 to full operation at the end of 1945. The machine was huge, weighing 30 tons, using 200 kilowatts of electric power and contained over 18,000 vacuum tubes, 1,500 relays, and hundreds of thousands of resistors, capacitors, and inductors.
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The principle of the modern computer was proposed by Alan Turing in his seminal 1936 paper, "On Computable Numbers". Turing proposed a simple device that he called "Universal Computing machine" and that is now known as a universal Turing machine. He proved that such a machine is capable of computing anything that is computable by executing instructions (program) stored on tape, allowing the machine to be programmable. The fundamental concept of Turing's design is the stored program, where all the instructions for computing are stored in memory. Von Neumann acknowledged that the central concept of the modern computer was due to this paper. Turing machines are to this day a central object of study in theory of computation. Except for the limitations imposed by their finite memory stores, modern computers are said to be Turing-complete, which is to say, they have algorithm execution capability equivalent to a universal Turing machine.
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Early computing machines had fixed programs. Changing its function required the re-wiring and re-structuring of the machine. With the proposal of the stored-program computer this changed. A stored-program computer includes by design an instruction set and can store in memory a set of instructions (a program) that details the computation. The theoretical basis for the stored-program computer was laid out by Alan Turing in his 1936 paper. In 1945, Turing joined the National Physical Laboratory and began work on developing an electronic stored-program digital computer. His 1945 report "Proposed Electronic Calculator" was the first specification for such a device. John von Neumann at the University of Pennsylvania also circulated his "First Draft of a Report on the EDVAC" in 1945.
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The Manchester Baby was the world's first stored-program computer. It was built at the University of Manchester in England by Frederic C. Williams, Tom Kilburn and Geoff Tootill, and ran its first program on 21 June 1948. It was designed as a testbed for the Williams tube, the first random-access digital storage device. Although the computer was described as "small and primitive" by a 1998 retrospective, it was the first working machine to contain all of the elements essential to a modern electronic computer. As soon as the Baby had demonstrated the feasibility of its design, a project began at the university to develop it into a practically useful computer, the Manchester Mark 1.
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The Mark 1 in turn quickly became the prototype for the Ferranti Mark 1, the world's first commercially available general-purpose computer. Built by Ferranti, it was delivered to the University of Manchester in February 1951. At least seven of these later machines were delivered between 1953 and 1957, one of them to Shell labs in Amsterdam. In October 1947 the directors of British catering company J. Lyons & Company decided to take an active role in promoting the commercial development of computers. Lyons's LEO I computer, modelled closely on the Cambridge EDSAC of 1949, became operational in April 1951 and ran the world's first routine office computer job.
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The concept of a field-effect transistor was proposed by Julius Edgar Lilienfeld in 1925. John Bardeen and Walter Brattain, while working under William Shockley at Bell Labs, built the first working transistor, the point-contact transistor, in 1947, which was followed by Shockley's bipolar junction transistor in 1948. From 1955 onwards, transistors replaced vacuum tubes in computer designs, giving rise to the "second generation" of computers. Compared to vacuum tubes, transistors have many advantages: they are smaller, and require less power than vacuum tubes, so give off less heat. Junction transistors were much more reliable than vacuum tubes and had longer, indefinite, service life. Transistorized computers could contain tens of thousands of binary logic circuits in a relatively compact space. However, early junction transistors were relatively bulky devices that were difficult to manufacture on a mass-production basis, which limited them to a number of specialised applications.
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At the University of Manchester, a team under the leadership of Tom Kilburn designed and built a machine using the newly developed transistors instead of valves. Their first transistorised computer and the first in the world, was operational by 1953, and a second version was completed there in April 1955. However, the machine did make use of valves to generate its 125 kHz clock waveforms and in the circuitry to read and write on its magnetic drum memory, so it was not the first completely transistorized computer. That distinction goes to the Harwell CADET of 1955, built by the electronics division of the Atomic Energy Research Establishment at Harwell.
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The metal–oxide–silicon field-effect transistor (MOSFET), also known as the MOS transistor, was invented by Mohamed M. Atalla and Dawon Kahng at Bell Labs in 1959. It was the first truly compact transistor that could be miniaturised and mass-produced for a wide range of uses. With its high scalability, and much lower power consumption and higher density than bipolar junction transistors, the MOSFET made it possible to build high-density integrated circuits. In addition to data processing, it also enabled the practical use of MOS transistors as memory cell storage elements, leading to the development of MOS semiconductor memory, which replaced earlier magnetic-core memory in computers. The MOSFET led to the microcomputer revolution, and became the driving force behind the computer revolution. The MOSFET is the most widely used transistor in computers, and is the fundamental building block of digital electronics.
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The idea of the integrated circuit was first conceived by a radar scientist working for the Royal Radar Establishment of the Ministry of Defence, Geoffrey W.A. Dummer. Dummer presented the first public description of an integrated circuit at the Symposium on Progress in Quality Electronic Components in Washington, D.C. on 7 May 1952.
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The first working ICs were invented by Jack Kilby at Texas Instruments and Robert Noyce at Fairchild Semiconductor. Kilby recorded his initial ideas concerning the integrated circuit in July 1958, successfully demonstrating the first working integrated example on 12 September 1958. In his patent application of 6 February 1959, Kilby described his new device as "a body of semiconductor material ... wherein all the components of the electronic circuit are completely integrated". However, Kilby's invention was a hybrid integrated circuit (hybrid IC), rather than a monolithic integrated circuit (IC) chip. Kilby's IC had external wire connections, which made it difficult to mass-produce.
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Noyce also came up with his own idea of an integrated circuit half a year later than Kilby. Noyce's invention was the first true monolithic IC chip. His chip solved many practical problems that Kilby's had not. Produced at Fairchild Semiconductor, it was made of silicon, whereas Kilby's chip was made of germanium. Noyce's monolithic IC was fabricated using the planar process, developed by his colleague Jean Hoerni in early 1959. In turn, the planar process was based on Mohamed M. Atalla's work on semiconductor surface passivation by silicon dioxide in the late 1950s.
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