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🔗 Psychology 🔗 Education

Bloom's 2 sigma problem refers to an educational phenomenon observed by educational psychologist Benjamin Bloom and initially reported in 1984 in the journal Educational Researcher. Bloom found that the average student tutored one-to-one using mastery learning techniques performed two standard deviations better than students who learn via conventional instructional methods — that is, "the average tutored student was above 98% of the students in the control class". Additionally, the variation of the students' achievement changed: "about 90% of the tutored students ... attained the level of summative achievement reached by only the highest 20%" of the control class. Bloom's graduate students J. Anania and A. J. Burke conducted studies of this effect at different grade levels and in different schools, observing students with "great differences in cognitive achievement, attitudes, and academic self-concept".

🔗 United States 🔗 Biography 🔗 Military history 🔗 Military history/North American military history 🔗 Military history/United States military history 🔗 Military history/Military biography 🔗 Biography/military biography

Harold L. Hering (born 1936) is a former officer of the United States Air Force, who was discharged in 1975 for requesting basic information about checks and balances to prevent an unauthorized order to launch nuclear missiles. Major Hering was subsequently presented the 2017 Courage of Conscience Award at the Peace Abbey, Boston, Massachusetts.

🔗 Physics 🔗 Electronics

Electromagnetically induced acoustic noise (and vibration), electromagnetically excited acoustic noise, or more commonly known as coil whine, is audible sound directly produced by materials vibrating under the excitation of electromagnetic forces. Some examples of this noise include the mains hum, hum of transformers, the whine of some rotating electric machines, or the buzz of fluorescent lamps. The hissing of high voltage transmission lines is due to corona discharge, not magnetism.

The phenomenon is also called audible magnetic noise, electromagnetic acoustic noise, lamination vibration or electromagnetically induced acoustic noise, or more rarely, electrical noise, or "coil noise", depending on the application. The term electromagnetic noise is generally avoided as the term is used in the field of electromagnetic compatibility, dealing with radio frequencies. The term electrical noise describes electrical perturbations occurring in electronic circuits, not sound. For the latter use, the terms electromagnetic vibrations or magnetic vibrations, focusing on the structural phenomenon are less ambiguous.

Acoustic noise and vibrations due to electromagnetic forces can be seen as the reciprocal of microphonics, which describes how a mechanical vibration or acoustic noise can induce an undesired electrical perturbation.

🔗 United States 🔗 Germany 🔗 Military history 🔗 Military history/North American military history 🔗 Military history/United States military history 🔗 Military history/Military science, technology, and theory 🔗 Military history/Weaponry 🔗 Military history/Intelligence 🔗 United Kingdom 🔗 Military history/World War II 🔗 Military history/German military history 🔗 Military history/European military history 🔗 Military history/British military history

Operation Epsilon was the codename of a program in which Allied forces near the end of World War II detained ten German scientists who were thought to have worked on Nazi Germany's nuclear program. The scientists were captured between May 1 and June 30, 1945, as part of the Allied Alsos Mission, mainly as part of its Operation Big sweep through southwestern Germany.

They were interned at Farm Hall, a bugged house in Godmanchester, near Cambridge, England, from July 3, 1945, to January 3, 1946. The primary goal of the program was to determine how close Nazi Germany had been to constructing an atomic bomb by listening to their conversations.

🔗 Companies 🔗 England 🔗 Food and drink 🔗 Brands

Bovril is the trademarked name of a thick and salty meat extract paste similar to a yeast extract, developed in the 1870s by John Lawson Johnston. It is sold in a distinctive, bulbous jar, and also as cubes and granules. Bovril is owned and distributed by Unilever UK.

Bovril can be made into a drink by diluting with hot water or, less commonly, with milk. It can be used as a flavouring for soups, broth, stews or porridge, or as a spread, especially on toast in a similar fashion to Marmite and Vegemite.

🔗 Evolutionary biology 🔗 Molecular Biology 🔗 Molecular Biology/Genetics

In evolutionary biology and population genetics, the error threshold (or critical mutation rate) is a limit on the number of base pairs a self-replicating molecule may have before mutation will destroy the information in subsequent generations of the molecule. The error threshold is crucial to understanding "Eigen's paradox".

The error threshold is a concept in the origins of life (abiogenesis), in particular of very early life, before the advent of DNA. It is postulated that the first self-replicating molecules might have been small ribozyme-like RNA molecules. These molecules consist of strings of base pairs or "digits", and their order is a code that directs how the molecule interacts with its environment. All replication is subject to mutation error. During the replication process, each digit has a certain probability of being replaced by some other digit, which changes the way the molecule interacts with its environment, and may increase or decrease its fitness, or ability to reproduce, in that environment.

🔗 Insects

An insect hotel, also known as a bug hotel or insect house, is a manmade structure created to provide shelter for insects. They can come in a variety of shapes and sizes depending on the specific purpose or specific insect it is catered to. Most consist of several different sections that provide insects with nesting facilities – particularly during winter, offering shelter or refuge for many types of insects. Their purposes include hosting pollinators.

🔗 Biography 🔗 Germany

Gustl Ferdinand Mollath (born 7 November 1956 in Nuremberg) is a German man who was acquitted during a criminal trial in 2006 on the basis of diminished criminal responsibility. He was committed to a high-security psychiatric hospital, as the court deemed him a danger to the public and declared him insane based on expert diagnoses of paranoid personality disorder. The judgment became the basis of controversy when elements of his supposed delusions regarding money-laundering activities at a major bank were found to be true. Mollath had consistently claimed there was a conspiracy to have him locked up in a psychiatric care ward because of his incriminating knowledge; evidence discovered in 2012 made his claims appear plausible.

In 2006, after being accused of assaulting his former wife, Petra Mollath, Gustl Mollath was tried at the District Court of Nürnberg-Fürth for aggravated assault and wrongful deprivation of personal liberty of his ex-wife as well as damage to property. The court considered the charges proven but acquitted Mollath on the basis of finding him criminally insane. A pivotal argument for Mollath's insanity, besides the general impression he made, was that he insisted his wife was involved in a complex system of tax evasion. The court came to call it a paranoid belief system Mollath had developed, which led him to accuse many people of being part of a conspiracy and acting irrationally and aggressively, by puncturing car tires of people in a way that could lead to accidents.

In 2012, the case was widely publicized when evidence brought to the attention of state prosecutors showed that suspicious activities were carried out over several years by members of staff (including Mollath's ex-wife) at the Munich-based HypoVereinsbank, as detailed in an internal audit report carried out by the bank in 2003. The reported money transfers were not illegal per se.

In June 2013, Mollath's former wife spoke for the first time to the press. According to her, Gustl Mollath was continually violent towards her, prior and during marriage. The alleged money laundering activities became an issue only after their divorce, which directly contradicts Gustl Mollath's version that he had suffered from the illegal activities of his former wife. Gustl Mollath has denied the allegations levied against him and has said that he was being persecuted for blowing the whistle on tax evasion at HypoVereinsbank.

On August 6, 2013, the Higher Regional Court of Nuremberg ordered a retrial and Mollath's immediate release, overturning a verdict of the Regional Court of Regensburg that had blocked a retrial.

Mollath's 2018 action for damages by the unlawful custody has been concluded in November 2019 by an ex gratia payment of €600,000 by the defendant Free State of Bavaria.

🔗 Aviation 🔗 Aviation/aircraft 🔗 United Kingdom 🔗 British Empire 🔗 Aviation/Defunct Airlines

The British Imperial Airship Scheme was a 1920s project to improve communication between Britain and the distant countries of the British Empire by establishing air routes using airships. This led to the construction of two large and technically advanced airships, the R100 and the R101. The scheme was terminated in 1931 following the crash of R101 in October 1930 while attempting its first flight to India.

🔗 Genetics 🔗 Evolutionary biology

Spiegelman's Monster is the name given to an RNA chain of only 218 nucleotides that is able to be reproduced by the RNA replication enzyme RNA-dependent RNA polymerase, also called RNA replicase. It is named after its creator, Sol Spiegelman, of the University of Illinois at Urbana-Champaign who first described it in 1965.