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🔗 Novels 🔗 Science Fiction 🔗 Transhumanism

A Fire Upon the Deep is a 1992 science fiction novel by American writer Vernor Vinge. It is a space opera involving superhuman intelligences, aliens, variable physics, space battles, love, betrayal, genocide, and a communication medium resembling Usenet. A Fire Upon the Deep won the Hugo Award in 1993, sharing it with Doomsday Book by Connie Willis.

Besides the normal print book editions, the novel was also included on a CD-ROM sold by ClariNet Communications along with the other nominees for the 1993 Hugo awards. The CD-ROM edition included numerous annotations by Vinge on his thoughts and intentions about different parts of the book, and was later released as a standalone e-book (no longer available).

🔗 Geology 🔗 Marine life 🔗 Algae

Diatoms (diá-tom-os 'cut in half', from diá, 'through' or 'apart'; and the root of tém-n-ō, 'I cut'.) are a major group of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of the Earth's biomass: they generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion metric tons of silicon each year from the waters in which they live, and contribute nearly half of the organic material found in the oceans. The shells of dead diatoms can reach as much as a half-mile (800m) deep on the ocean floor, and the entire Amazon basin is fertilized annually by 27 million tons of diatom shell dust transported by transatlantic winds from the African Sahara, much of it from the Bodélé Depression, which was once made up a system of fresh-water lakes.

Diatoms are unicellular: they occur either as solitary cells or in colonies, which can take the shape of ribbons, fans, zigzags, or stars. Individual cells range in size from 2 to 200 micrometers. In the presence of adequate nutrients and sunlight, an assemblage of living diatoms doubles approximately every 24 hours by asexual multiple fission; the maximum life span of individual cells is about six days. Diatoms have two distinct shapes: a few (centric diatoms) are radially symmetric, while most (pennate diatoms) are broadly bilaterally symmetric. A unique feature of diatom anatomy is that they are surrounded by a cell wall made of silica (hydrated silicon dioxide), called a frustule. These frustules have structural coloration due to their photonic nanostructure, prompting them to be described as "jewels of the sea" and "living opals". Movement in diatoms primarily occurs passively as a result of both water currents and wind-induced water turbulence; however, male gametes of centric diatoms have flagella, permitting active movement for seeking female gametes. Similar to plants, diatoms convert light energy to chemical energy by photosynthesis, although this shared autotrophy evolved independently in both lineages. Unusually for autotrophic organisms, diatoms possess a urea cycle, a feature that they share with animals, although this cycle is used to different metabolic ends in diatoms. The family Rhopalodiaceae also possess a cyanobacterial endosymbiont called a spheroid body. This endosymbiont has lost its photosynthetic properties, but has kept its ability to perform nitrogen fixation, allowing the diatom to fix atmospheric nitrogen.

The study of diatoms is a branch of phycology. Diatoms are classified as eukaryotes, organisms with a membrane-bound cell nucleus, that separates them from the prokaryotes archaea and bacteria. Diatoms are a type of plankton called phytoplankton, the most common of the plankton types. Diatoms also grow attached to benthic substrates, floating debris, and on macrophytes. They comprise an integral component of the periphyton community. Another classification divides plankton into eight types based on size: in this scheme, diatoms are classed as microalgae. Several systems for classifying the individual diatom species exist. Fossil evidence suggests that diatoms originated during or before the early Jurassic period, which was about 150 to 200 million years ago.

Diatoms are used to monitor past and present environmental conditions, and are commonly used in studies of water quality. Diatomaceous earth (diatomite) is a collection of diatom shells found in the earth's crust. They are soft, silica-containing sedimentary rocks which are easily crumbled into a fine powder and typically have a particle size of 10 to 200 μm. Diatomaceous earth is used for a variety of purposes including for water filtration, as a mild abrasive, in cat litter, and as a dynamite stabilizer.

🔗 Oregon 🔗 Novels 🔗 Novels/19th century

The Begum's Fortune (French: Les Cinq cents millions de la Bégum, literally "the 500 millions of the begum"), also published as The Begum's Millions, is an 1879 novel by Jules Verne, with some utopian elements and other elements that seem clearly dystopian. It is noteworthy as the first published book in which Verne was cautionary, and somewhat pessimistic about the development of science and technology.

Long after The Begum's Fortune was published, it came out that its story is based on a manuscript by Paschal Grousset, a Corsican revolutionary who had participated in the Paris Commune and was at the time living in exile in the United States and London. It was bought by Pierre-Jules Hetzel, the publisher of most of Verne's books. The attribution of plot elements between Grousset's original text and Verne's work on it has not been completely defined. Later, Verne worked similarly on two more books by Grousset and published them under his name, before the revolutionary finally got a pardon and was able to return to France and resume publication in his own name.

The book first appeared in a hasty and poorly done English translation soon after its publication in French—one of the bad translations considered to have damaged Verne's reputation in the English-speaking world. W. H. G. Kingston was near death and deeply in debt at the time. His wife, Mrs. A. K. Kingston, who did the translation for him, was certainly otherwise preoccupied than with the accuracy of the text and may have had to rely on outside help. In 2005 a new translation from the French was made by Stanford Luce and published by Wesleyan University.

I. O. Evans, in his introduction to his "Fitzroy Edition" of The Begum's Fortune, suggested a connection between the creation of artificial satellites in this novel and the publication of The Brick Moon by Edward Everett Hale in 1869.

🔗 California 🔗 Organizations 🔗 Scientology 🔗 California/Inland Empire

The Sea Organization (also known as the Sea Org) is a Scientology organization, which the Church of Scientology describes as a "fraternal religious order, comprising the church's most dedicated members". All Scientology management organizations are controlled exclusively by members of the Sea Org. David Miscavige, the de facto leader of Scientology, is the highest-ranking Sea Org officer, holding the rank of captain.

The Sea Org has been described as a paramilitary organization and as a private naval force, having operated several vessels in its past and displaying a maritime tradition. Some ex-members and scholars have described the Sea Org as a totalitarian organization marked by intensive surveillance and a lack of freedom. The Sea Org has also been compared to a monastic organization.

In a 1992 memorandum by the Church of Scientology International, the following information was provided to the Internal Revenue Service with regards to nature of the Sea Org:

[the Sea Org] does not have an ecclesiastical organizing board or command channels chart or secular existence such as an incorporated or unincorporated association. ... Although there is no such "organization" as the Sea Organization, the term Sea Org has a colloquial usage which implies that there is. There are general recruitment posters and literature for "The Sea Org" which implies that people will be employed by the Sea Org when in reality they will join, making the billion year commitment, at some church that is staffed by Sea Org members and become employees of that church corporation. ... The Sea Org exists as a spiritual commitment that is factually beyond the full understanding of the Service or any other but a trained and audited Scientologist.

The Sea Org was established on August 12, 1967, by L. Ron Hubbard, the founder of Dianetics and Scientology, initially on board three ships, the Diana, the Athena, and the Apollo, with the latter serving as flagship.

In 1971, the Sea Org assumed responsibility for the church's ecclesiastical development, and in particular the delivery of the upper levels of its auditing and training, known as the Operating Thetan or "OT" levels. In 1981, under the aegis of the Commodore's Messenger Organization led by David Miscavige, the Sea Org dissolved the Guardian's Office (GO) and assumed full responsibility for the church's international management, later reassigning the GO's duties to the Office of Special Affairs in 1983 during the corporate restructuring of the Church.

It moved to land-based organizations in 1975, though maritime customs persist, with many members wearing naval-style uniforms and addressing both male and female officers as "sir." In 1985, the church purchased a 440-foot (130 m) motor vessel, the Freewinds, which docks in Curaçao in the southern Caribbean and is used as a religious retreat and training center, staffed entirely by Sea Org members. Sea Org members make a lifetime commitment to Scientology by signing a billion-year contract officially described as a symbolic pledge. In exchange, members are given free room and board, as well as a small weekly allowance. Sea Org members agree to strict codes of discipline, such as disavowing premarital sex, working long hours (on average at least 100 hours per week) and living in communal housing called "berthings." They are allowed to marry, but must relinquish their membership if they have or want to raise children.

🔗 Psychology 🔗 Neuroscience 🔗 Physiology 🔗 Physiology/neuro

An amygdala hijack refers to a personal, emotional response that is immediate, overwhelming, and out of measure with the actual stimulus because it has triggered a much more significant emotional threat. The term was coined by Daniel Goleman in his 1996 book Emotional Intelligence: Why It Can Matter More Than IQ.

🔗 Computer science 🔗 Systems 🔗 Human–Computer Interaction

In artificial intelligence, an expert system is a computer system emulating the decision-making ability of a human expert. Expert systems are designed to solve complex problems by reasoning through bodies of knowledge, represented mainly as if–then rules rather than through conventional procedural code. The first expert systems were created in the 1970s and then proliferated in the 1980s. Expert systems were among the first truly successful forms of artificial intelligence (AI) software. An expert system is divided into two subsystems: the inference engine and the knowledge base. The knowledge base represents facts and rules. The inference engine applies the rules to the known facts to deduce new facts. Inference engines can also include explanation and debugging abilities.

🔗 Computing

The Law of Demeter (LoD) or principle of least knowledge is a design guideline for developing software, particularly object-oriented programs. In its general form, the LoD is a specific case of loose coupling. The guideline was proposed by Ian Holland at Northeastern University towards the end of 1987, and can be succinctly summarized in each of the following ways:

• Each unit should have only limited knowledge about other units: only units "closely" related to the current unit.
• Each unit should only talk to its friends; don't talk to strangers.
• Only talk to your immediate friends.

The fundamental notion is that a given object should assume as little as possible about the structure or properties of anything else (including its subcomponents), in accordance with the principle of "information hiding". It may be viewed as a corollary to the principle of least privilege, which dictates that a module possess only the information and resources necessary for its legitimate purpose.

It is so named for its origin in the Demeter Project, an adaptive programming and aspect-oriented programming effort. The project was named in honor of Demeter, “distribution-mother” and the Greek goddess of agriculture, to signify a bottom-up philosophy of programming which is also embodied in the law itself.

🔗 Military history 🔗 Classical Greece and Rome 🔗 Military history/Roman and Byzantine military history 🔗 Theatre 🔗 Martial arts

The naumachia (in Latin naumachia, from the Ancient Greek ναυμαχία/naumachía, literally "naval combat") in the Ancient Roman world referred to both the staging of naval battles as mass entertainment, and the basin or building in which this took place.

🔗 Finland 🔗 Roots music

Säkkijärven polkka ("the Säkkijärvi polka"), also called the "Karelian-Finnish Polka," is a well-known folk tune from Finland, very popular with Finnish accordionists. It was especially popularized by Viljo "Vili" Vesterinen (1907–1961). The tune was first recorded in Säkkijärvi (now Kondratyevo in the Leningrad Oblast, Russia), and the lyrics sometimes sung with the tune state that while Säkkijärvi itself might have been lost (ceded to the Soviet Union in 1940), the Finns at least still had the polka.

🔗 Computing 🔗 Robotics

The Viterbi algorithm is a dynamic programming algorithm for obtaining the maximum a posteriori probability estimate of the most likely sequence of hidden states—called the Viterbi path—that results in a sequence of observed events, especially in the context of Markov information sources and hidden Markov models (HMM).

The algorithm has found universal application in decoding the convolutional codes used in both CDMA and GSM digital cellular, dial-up modems, satellite, deep-space communications, and 802.11 wireless LANs. It is now also commonly used in speech recognition, speech synthesis, diarization, keyword spotting, computational linguistics, and bioinformatics. For example, in speech-to-text (speech recognition), the acoustic signal is treated as the observed sequence of events, and a string of text is considered to be the "hidden cause" of the acoustic signal. The Viterbi algorithm finds the most likely string of text given the acoustic signal.