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๐ The Dreyfus affair
The Dreyfus Affair (French: l'affaire Dreyfus, pronouncedย [lafษหส dสษfys]) was a political scandal that divided the Third French Republic from 1894 until its resolution in 1906. "The Affair", as it is known in French, has come to symbolise modern injustice in the Francophone world, and it remains one of the most notable examples of a complex miscarriage of justice and antisemitism. The role played by the press and public opinion proved influential in the conflict.
The scandal began in December 1894 when Captain Alfred Dreyfus was convicted of treason. Dreyfus was a 35-year-old Alsatian French artillery officer of Jewish descent. He was sentenced to life imprisonment for allegedly communicating French military secrets to the German Embassy in Paris, and was imprisoned on Devil's Island in French Guiana, where he spent nearly five years.
In 1896, evidence came to lightโprimarily through an investigation instigated by Georges Picquart, head of counter-espionageโwhich identified the real culprit as a French Army major named Ferdinand Walsin Esterhazy. When high-ranking military officials suppressed the new evidence, a military court unanimously acquitted Esterhazy after a trial lasting only two days. The Army laid additional charges against Dreyfus, based on forged documents. Subsequently, รmile Zola's open letter J'Accuseโฆ!, stoked a growing movement of support for Dreyfus, putting pressure on the government to reopen the case.
In 1899, Dreyfus was returned to France for another trial. The intense political and judicial scandal that ensued divided French society between those who supported Dreyfus (now called "Dreyfusards"), such as Sarah Bernhardt, Anatole France, Henri Poincarรฉ and Georges Clemenceau, and those who condemned him (the anti-Dreyfusards), such as รdouard Drumont, the director and publisher of the antisemitic newspaper La Libre Parole. The new trial resulted in another conviction and a 10-year sentence, but Dreyfus was pardoned and released. In 1906, Dreyfus was exonerated and reinstated as a major in the French Army. He served during the whole of World War I, ending his service with the rank of lieutenant-colonel. He died in 1935.
The affair from 1894 to 1906 divided France into pro-republican, anticlerical, Dreyfusards and pro-Army, mostly Catholic "anti-Dreyfusards". It embittered French politics and encouraged radicalisation.
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- "The Dreyfus affair" | 2013-06-23 | 13 Upvotes 2 Comments
๐ Men's Underwear Index
The men's underwear index (MUI) is an economic index that can supposedly detect the beginnings of a recovery during an economic slump. The premise is that men's underwear are a necessity in normal economic times and sales remain stable. During a severe downturn, demand for these goods changes as new purchases are deferred. Hence, men's purchasing habits for underwear (and that of their spouses on their behalf) is thought to be a good indicator of discretionary spending for consumption at large especially during turnaround periods.
This indicator is noted for being followed by former Federal Reserve Chairman, Alan Greenspan.
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- "Men's Underwear Index" | 2022-03-27 | 12 Upvotes 2 Comments
๐ Cantor function, a.k.a. devil's staircase: increasing function with 0 derivative
In mathematics, the Cantor function is an example of a function that is continuous, but not absolutely continuous. It is a notorious counterexample in analysis, because it challenges naive intuitions about continuity, derivative, and measure. Though it is continuous everywhere and has zero derivative almost everywhere, its value still goes from 0 to 1 as its argument reaches from 0 to 1. Thus, in one sense the function seems very much like a constant one which cannot grow, and in another, it does indeed monotonically grow, by construction.
It is also referred to as the Cantor ternary function, the Lebesgue function, Lebesgue's singular function, the CantorโVitali function, the Devil's staircase, the Cantor staircase function, and the CantorโLebesgue function. Georg Cantorย (1884) introduced the Cantor function and mentioned that Scheeffer pointed out that it was a counterexample to an extension of the fundamental theorem of calculus claimed by Harnack. The Cantor function was discussed and popularized by Scheeffer (1884), Lebesgue (1904) and Vitali (1905).
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- "Cantor function, a.k.a. devil's staircase: increasing function with 0 derivative" | 2020-06-11 | 96 Upvotes 52 Comments
๐ SimHealth: The National Health Care Simulation
SimHealth: The National Health Care Simulation is a management simulation video game, developed by Thinking Tools and published by Maxis with assistance from the Markle Foundation for MS-DOS in 1994. It is a simulation of the U.S. Healthcare system. The game was released during Congressional debates on the Clinton health care plan.
Due to the complexity of the game, SimHealth was seen as being very difficult. Armed with none of the tongue-in-cheek humor that Maxis's prior games were known for, the only real link to the franchise was the SimCity 2000-inspired user interface. The game was seen as more serious than other Maxis games. Noel Fritzinger, who with Lyman Orton first conceptualized CommunityViz, says that his inspiration came from seeing SimHealth and wondering if the same concepts could be applied to real-world land-use planning.
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- "SimHealth: The National Health Care Simulation" | 2016-05-28 | 13 Upvotes 5 Comments
๐ Gonzalo Guerrero
Gonzalo Guerrero (also known as Gonzalo Marinero, Gonzalo de Aroca and Gonzalo de Aroza) was a sailor from Palos, Spain who was shipwrecked along the Yucatรกn Peninsula and was taken as a slave by the local Maya. Earning his freedom, Guerrero became a respected warrior under a Maya lord and raised three of the first mestizo children in Mexico and one of the first mestizo children in the Americas, alongside Miguel Dรญez de Aux and the children of Caramuru and Joรฃo Ramalho in Brazil. Little is known of his early life.
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- "Gonzalo Guerrero" | 2025-05-11 | 98 Upvotes 27 Comments
๐ What is it like to be a bat?
"What Is It Like to Be a Bat?" is a paper by American philosopher Thomas Nagel, first published in The Philosophical Review in October 1974, and later in Nagel's Mortal Questions (1979). The paper presents several difficulties posed by phenomenal consciousness, including the potential insolubility of the mindโbody problem owing to "facts beyond the reach of human concepts", the limits of objectivity and reductionism, the "phenomenological features" of subjective experience, the limits of human imagination, and what it means to be a particular, conscious thing.
Nagel asserts that "an organism has conscious mental states if and only if there is something that it is like to be that organismโsomething it is like for the organism." This assertion has achieved special status in consciousness studies as "the standard 'what it's like' locution". Daniel Dennett, while sharply disagreeing on some points, acknowledged Nagel's paper as "the most widely cited and influential thought experiment about consciousness".
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- "What is it like to be a bat?" | 2025-09-03 | 181 Upvotes 294 Comments
๐ Kramatorsk Radiological Accident
The Kramatorsk radiological accident was a radiation accident that happened in Kramatorsk, in the Ukrainian SSR from 1980 to 1989. A small capsule containing highly radioactive caesium-137 was found inside the concrete wall of an apartment building, with a surface gamma radiation exposure dose rate of 1800ย R/year. The capsule was detected only after residents requested that the level of radiation in the apartment be measured by a health physicist.
The capsule was originally part of a radiation level gauge and was lost in the Karansky quarry in the late 1970s. The search for the capsule was unsuccessful and ended after a week. The gravel from the quarry was used in construction. The caesium capsule ended up in the concrete panel of apartment 85 of building 7 on Mariyi Pryimachenko Street (at the time under the Soviet name Gvardeytsiv Kantemirovtsiv), between apartments 85 and 52.
Over nine years, two families lived in apartment 85. A child's bed was located directly next to the wall containing the capsule. The apartment was fully settled in 1980. A year later, an 18-year-old woman who lived there suddenly died. In 1982, her 16-year-old brother followed, and then their mother. Even after that the flat did not attract much public attention, despite the fact that the residents all died from leukemia. Doctors were unable to determine root-cause of illness and explained the diagnosis by poor heredity. A new family moved into the apartment, and their son died from leukemia as well. His father managed to start a detailed investigation, during which the vial was found in the wall in 1989.
By the time the capsule was discovered, four residents of the building had died from it and 17 more had received varying doses of radiation. Part of the wall was removed and sent to the Institute for Nuclear Research, where the caesium capsule was removed, identified by serial number and disposed of.
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- "Kramatorsk Radiological Accident" | 2023-04-02 | 60 Upvotes 13 Comments
๐ The Indian state of Kerala has a communist government and India's highest HDI
Communism in Kerala refers to the strong presence of communist ideas in the Indian state of Kerala. In addition to Kerala, the Indian states of West Bengal and Tripura have had multiple democratically elected Marxist governments, and change takes place in the government by regular multiparty electoral processes. Communism of Kerala has provided Indian communist stalwarts such as M. N. Govindan Nair, C. Achutha Menon, K. Damodaran, T. V. Thomas, N. E. Balaram, E. M. S. Namboodiripad, A. K. Gopalan, K. R. Gouri Amma, P. K. Vasudevan Nair and C. K. Chandrappan
Today the two largest communist parties in Kerala politics are the Communist Party of India (Marxist) and the Communist Party of India. The Left Democratic Front is a coalition of left-wing political parties in the state of Kerala and is one of the two major political coalitions in Kerala, each of which have been in power alternatively for the last two decades. The coalition led by the Communist Party of India (Marxist) consists of the Communist Party of India, the Janata Dal (Secular), the Nationalist Congress Party, the Indian National League, the Kerala Congress (Anti-merger Group), and the Indian National Congress (Socialist).
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- "The Indian state of Kerala has a communist government and India's highest HDI" | 2021-12-22 | 15 Upvotes 5 Comments
๐ Olbers' paradox
In astrophysics and physical cosmology, Olbers' paradox, named after the German astronomer Heinrich Wilhelm Olbers (1758โ1840), also known as the "dark night sky paradox", is the argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. In the hypothetical case that the universe is static, homogeneous at a large scale, and populated by an infinite number of stars, then any line of sight from Earth must end at the (very bright) surface of a star and hence the night sky should be completely illuminated and very bright. This contradicts the observed darkness and non-uniformity of the night.
The darkness of the night sky is one of the pieces of evidence for a dynamic universe, such as the Big Bang model. That model explains the observed non-uniformity of brightness by invoking spacetime's expansion, which lengthens the light originating from the Big Bang to microwave levels via a process known as redshift; this microwave radiation background has wavelengths much longer than those of visible light, so appears dark to the naked eye. Other explanations for the paradox have been offered, but none have wide acceptance in cosmology.
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- "Olbers' Paradox" | 2022-03-27 | 75 Upvotes 50 Comments
- "Olbers' paradox" | 2015-08-02 | 40 Upvotes 20 Comments
๐ Strowger Telephone Switch (1891)
The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics it is also known as a step-by-step (SXS) switch.
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- "Strowger Telephone Switch (1891)" | 2016-11-24 | 22 Upvotes 12 Comments