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π Old Stockholm Telephone Tower
The Old Stockholm telephone tower (Swedish: Telefontornet) was a metallic structure built to connect approximately 5,500 telephone lines in the Swedish capital of Stockholm. Constructed in 1887, the tower was used until 1913. It was damaged by a fire in 1952 and demolished the following year.
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- "Old Stockholm Telephone Tower" | 2025-10-02 | 168 Upvotes 52 Comments
π The Illiac IV Computer
The ILLIAC IV was the first massively parallel computer. The system was originally designed to have 256 64-bit floating point units (FPUs) and four central processing units (CPUs) able to process 1 billion operations per second. Due to budget constraints, only a single "quadrant" with 64 FPUs and a single CPU was built. Since the FPUs all had to process the same instruction β ADD, SUB etc. β in modern terminology the design would be considered to be single instruction, multiple data, or SIMD.
The concept of building a computer using an array of processors came to Daniel Slotnick while working as a programmer on the IAS machine in 1952. A formal design did not start until 1960, when Slotnick was working at Westinghouse Electric and arranged development funding under a US Air Force contract. When that funding ended in 1964, Slotnick moved to the University of Illinois and joined the Illinois Automatic Computer (ILLIAC) team. With funding from Advanced Research Projects Agency (ARPA), they began the design of a newer concept with 256 64-bit processors instead of the original concept with 1,024 1-bit processors.
While the machine was being built at Burroughs, the university began building a new facility to house it. Political tension over the funding from the US Department of Defense led to the ARPA and the University fearing for the machine's safety. When the first 64-processor quadrant of the machine was completed in 1972, it was sent to the NASA Ames Research Center in California. After three years of thorough modification to fix various flaws, ILLIAC IV was connected to the ARPANet for distributed use in November 1975, becoming the first network-available supercomputer, beating the Cray-1 by nearly 12 months.
Running at half its design speed, the one-quadrant ILLIAC IV delivered 50Β MFLOP peak, making it the fastest computer in the world at that time. It is also credited with being the first large computer to use solid-state memory, as well as the most complex computer built to date, with over 1 million gates. Generally considered a failure due to massive budget overruns, the design was instrumental in the development of new techniques and systems for programming parallel systems. In the 1980s, several machines based on ILLIAC IV concepts were successfully delivered.
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- "The Illiac IV Computer" | 2020-06-04 | 56 Upvotes 10 Comments
π Daniel W. Dobberpuhl
Daniel "Dan" William Dobberpuhl (March 25, 1945Β β October 26, 2019) was an electrical engineer in the United States who led several teams of microprocessor designers.
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- "Daniel W. Dobberpuhl" | 2019-11-17 | 48 Upvotes 14 Comments
π Deseret Alphabet
The Deseret alphabet ( (listen); Deseret: ππ―π π¨ππ―π» or ππ―ππ²ππ―π») is a phonemic English-language spelling reform developed between 1847 and 1854 by the board of regents of the University of Deseret under the leadership of Brigham Young, the second president of the Church of Jesus Christ of Latter-day Saints (LDS Church). George D. Watt is reported to have been the most actively involved in the development of the script,:β159β as well as being its first serious user.:β12β
The Deseret alphabet was an outgrowth of the idealism and utopianism of Young and the early LDS Church. Young and the Mormon pioneers believed "all aspects of life" were in need of reform for the imminent millenniumand the Deseret alphabet was just one of many ways they sought to bring about a complete "transformation in society",:β142β in anticipation of the Second Coming of Jesus. Young wrote of the reform that "it would represent every sound used in the construction of any known language; and, in fact, a step and partial return to a pure language which has been promised unto us in the latter days," the Adamic language spoken before the Tower of Babel.
In public statements, Young claimed the alphabet would replace the traditional Latin alphabet with an alternative, more phonetically accurate alphabet for the English language. This would offer immigrants an opportunity to learn to read and write English, he said, the orthography of which is often less phonetically consistent than those of many other languages.:β65β66β Similar neographies have been attempted, the most well-known of which for English is the Shavian alphabet.
Young also prescribed the learning of Deseret to the school system, stating "It will be the means of introducing uniformity in our orthography, and the years that are now required to learn to read and spell can be devoted to other studies."
During the alphabet's heyday between 1854 and 1869, scriptural passages in newspapers, selected church records, a $5 gold coin, and occasional street signs and correspondence used the new letters. In 1868-9, after much difficulty creating suitable fonts, four books were printed: two school primers, the full Book of Mormon, and a portion of it titled the Book of Nephi.
Despite heavy and costly promotion by the early LDS Church, the alphabet never enjoyed prolonged widespread use and has been regarded by historians as a failure. However, in recent years, aided by digital typography, the Deseret Alphabet has been revived as a cultural heirloom.
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- "Deseret Alphabet" | 2023-05-01 | 140 Upvotes 71 Comments
π Occupy Wall Street
Occupy Wall Street (OWS) was a left-wing populist movement against economic inequality, corporate greed, big finance, and the influence of money in politics that began in Zuccotti Park, located in New York City's Financial District, and lasted for fifty-nine daysβfrom September 17 to November 15, 2011.
The motivations for Occupy Wall Street largely resulted from public distrust in the private sector during the aftermath of the Great Recession in the United States. There were many particular points of interest leading up to the Occupy movement that angered populist and left-wing groups. For instance, the 2008 bank bailouts under the George W. Bush administration utilized congressionally appropriated taxpayer funds to create the Troubled Asset Relief Program (TARP), which purchased toxic assets from failing banks and financial institutions. The U.S. Supreme Court ruling in Citizens United v. FEC in January 2010 allowed corporations to spend unlimited amounts on independent political expenditures without government regulation. This angered many populist and left-wing groups that viewed the ruling as a way for moneyed interests to corrupt public institutions and legislative bodies, such as the United States Congress.
The protests gave rise to the wider Occupy movement in the United States and other Western countries. The Canadian anti-consumerist magazine Adbusters initiated the call for a protest. The main issues raised by Occupy Wall Street were social and economic inequality, greed, corruption and the undue influence of corporations on governmentβparticularly from the financial services sector. The OWS slogan, "We are the 99%", refers to income and wealth inequality in the U.S. between the wealthiest 1% and the rest of the population. To achieve their goals, protesters acted on consensus-based decisions made in general assemblies which emphasized redress through direct action over the petitioning to authorities.
The protesters were forced out of Zuccotti Park on November 15, 2011. Protesters then turned their focus to occupying banks, corporate headquarters, board meetings, foreclosed homes, college and university campuses and social media.
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- "Occupy Wall Street" | 2024-05-05 | 25 Upvotes 4 Comments
π Balfour Declaration
The Balfour Declaration was a public statement issued by the British government in 1917 during the First World War announcing its support for the establishment of a "national home for the Jewish people" in Palestine, then an Ottoman region with a small minority Jewish population. The declaration was contained in a letter dated 2Β November 1917 from the United Kingdom's Foreign Secretary Arthur Balfour to Lord Rothschild, a leader of the British Jewish community, for transmission to the Zionist Federation of Great Britain and Ireland. The text of the declaration was published in the press on 9Β November 1917.
Immediately following their declaration of war on the Ottoman Empire in November 1914, the British War Cabinet began to consider the future of Palestine; within two months a memorandum was circulated to the Cabinet by a Zionist Cabinet member, Herbert Samuel, proposing the support of Zionist ambitions in order to enlist the support of Jews in the wider war. A committee was established in April 1915 by British Prime Minister H. H. Asquith to determine their policy towards the Ottoman Empire including Palestine. Asquith, who had favoured post-war reform of the Ottoman Empire, resigned in December 1916; his replacement David Lloyd George favoured partition of the Empire. The first negotiations between the British and the Zionists took place at a conference on 7 February 1917 that included Sir Mark Sykes and the Zionist leadership. Subsequent discussions led to Balfour's request, on 19 June, that Rothschild and Chaim Weizmann submit a draft of a public declaration. Further drafts were discussed by the British Cabinet during September and October, with input from Zionist and anti-Zionist Jews but with no representation from the local population in Palestine.
By late 1917, in the lead-up to the Balfour Declaration, the wider war had reached a stalemate, with two of Britain's allies not fully engaged: the United States had yet to suffer a casualty, and the Russians were in the midst of a revolution with Bolsheviks taking over the government. A stalemate in southern Palestine was broken by the Battle of Beersheba on 31 October 1917. The release of the final declaration was authorised on 31 October; the preceding Cabinet discussion had referenced perceived propaganda benefits amongst the worldwide Jewish community for the Allied war effort.
The opening words of the declaration represented the first public expression of support for Zionism by a major political power. The term "national home" had no precedent in international law, and was intentionally vague as to whether a Jewish state was contemplated. The intended boundaries of Palestine were not specified, and the British government later confirmed that the words "in Palestine" meant that the Jewish national home was not intended to cover all of Palestine. The second half of the declaration was added to satisfy opponents of the policy, who had claimed that it would otherwise prejudice the position of the local population of Palestine and encourage antisemitism worldwide by "stamping the Jews as strangers in their native lands". The declaration called for safeguarding the civil and religious rights for the Palestinian Arabs, who composed the vast majority of the local population, and also the rights and political status of the Jewish communities in other countries outside of Palestine. The British government acknowledged in 1939 that the local population's wishes and interests should have been taken into account, and recognised in 2017 that the declaration should have called for the protection of the Palestinian Arabs' political rights.
The declaration had many long-lasting consequences. It greatly increased popular support for Zionism within Jewish communities worldwide, and became a core component of the British Mandate for Palestine, the founding document of Mandatory Palestine. It indirectly led to the emergence of Israel and is considered a principal cause of the ongoing IsraeliβPalestinian conflict, often described as the world's most intractable conflict. Controversy remains over a number of areas, such as whether the declaration contradicted earlier promises the British made to the Sharif of Mecca in the McMahonβHussein correspondence.
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- "Balfour Declaration" | 2023-10-19 | 16 Upvotes 7 Comments
π Tsiolkovsky Rocket Equation
The Tsiolkovsky rocket equation, classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity can thereby move due to the conservation of momentum.
where:
- is delta-v β the maximum change of velocity of the vehicle (with no external forces acting).
- is the initial total mass, including propellant, also known as wet mass.
- is the final total mass without propellant, also known as dry mass.
- is the effective exhaust velocity, where:
- is the specific impulse in dimension of time.
- is standard gravity.
- is the natural logarithm function.
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- "Tsiolkovsky Rocket Equation" | 2020-09-21 | 17 Upvotes 1 Comments
π Colossus: The Forbin Project
Colossus: The Forbin Project (originally released as Colossus) is a 1970 American science-fiction thriller film from Universal Pictures, produced by Stanley Chase, directed by Joseph Sargent, and starring Eric Braeden, Susan Clark, Gordon Pinsent, and William Schallert. It is based on the 1966 science-fiction novel Colossus by Dennis Feltham Jones.
The film is about an advanced American defense system, named Colossus, which becomes sentient. After being given full control, Colossus' draconian logic expands on its original nuclear defense directives to assume total control of the world and end all warfare for the good of humankind, despite its creators' orders to stop.
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- "Colossus: The Forbin Project" | 2026-05-14 | 254 Upvotes 98 Comments
π GOES 3 satellite
GOES-3, known as GOES-C before becoming operational, is an American geostationary weather and communications satellite. It was originally built for the National Oceanic and Atmospheric Administration as part of the Geostationary Operational Environmental Satellite system, and was launched in June 1978. It is positioned in geostationary orbit, from where it was initially used for weather forecasting in the United States. Since ceasing to function as a weather satellite in 1989, it has been used as a communications satellite, and has spent over thirty-eight years in operation. GOES-3 was decommissioned 29 June 2016 at the CSTARS facility in Miami, Florida.
GOES-3 was built by Ford Aerospace, and is based on the satellite bus developed for the SMS programme. At launch it had a mass of 627 kilograms (1,382Β lb).
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- "GOES 3 satellite" | 2016-06-22 | 18 Upvotes 11 Comments
π The Nature of the Firm (1937)
"The Nature of the Firm" (1937) is an article by Ronald Coase. It offered an economic explanation of why individuals choose to form partnerships, companies and other business entities rather than trading bilaterally through contracts on a market. The author was awarded the Nobel Memorial Prize in Economic Sciences in 1991 in part due to this paper. Despite the honor, the paper was written when Coase was an undergraduate and he described it later in life as "little more than an undergraduate essay."
The article argues that firms emerge because they are better equipped to deal with the transaction costs inherent in production and exchange than individuals are. Economists such as Oliver Williamson, Douglass North, Oliver Hart, Bengt HolmstrΓΆm, Arman Alchian and Harold Demsetz expanded on Coase's work on firms, transaction costs and contracts. Economists and political scientists have used insights from Coase's work to explain the functioning of organizations in general, not just firms. Coase's work strongly influenced the New Economics of Organization (New Institutional Economics).
Coase's article distinguished between markets as a coordination mechanism and firms as a coordination mechanism.
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- "The Nature of the Firm (1937)" | 2022-05-13 | 132 Upvotes 56 Comments