Have a deep view into what people are curious about.

🔗 Medicine 🔗 Psychology 🔗 Japan

Retired husband syndrome (主人在宅ストレス症候群, Shujin Zaitaku Sutoresu Shoukougun, literally "One's Husband Being at Home Stress Syndrome") (RHS) is a psychosomatic stress-related illness which has been estimated to occur in 60% of Japan's older female population. It is a condition where a woman begins to exhibit signs of physical illness and depression as her husband reaches, or approaches, retirement.

🔗 Technology 🔗 Military history 🔗 Military history/Military aviation 🔗 Military history/North American military history 🔗 Military history/Military science, technology, and theory 🔗 Military history/Weaponry 🔗 Canada 🔗 Architecture 🔗 United Kingdom 🔗 Military history/Maritime warfare 🔗 Military history/World War II 🔗 Engineering 🔗 Ships 🔗 Military history/Canadian military history 🔗 Military history/European military history 🔗 Military history/British military history

Project Habakkuk or Habbakuk (spelling varies) was a plan by the British during the Second World War to construct an aircraft carrier out of pykrete (a mixture of wood pulp and ice) for use against German U-boats in the mid-Atlantic, which were beyond the flight range of land-based planes at that time. The idea came from Geoffrey Pyke, who worked for Combined Operations Headquarters. After promising scale tests and the creation of a prototype on a lake (Patricia Lake, Jasper National Park) in Alberta, Canada, the project was shelved due to rising costs, added requirements, and the availability of longer-range aircraft and escort carriers which closed the Mid-Atlantic gap the project was intended to address.

🔗 Transport 🔗 Urban studies and planning 🔗 Engineering

A manhole cover or maintenance hole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

Manhole covers date back at least to the era of ancient Rome, which had sewer grates made from stone.

🔗 History 🔗 Lists 🔗 Geography 🔗 Israel 🔗 Palestine

The population of the region of Palestine, which approximately corresponds to modern Israel, the Palestinian territories and Jordan, has varied in both size and ethnic composition throughout its history.

The following table shows the total population and that of the main ethno-religious groups living in the area from the First Century CE up until the last full calendar year of the British Mandate, 1947.

Note: Figures prior to the 1500s are all only estimates by researchers. For some periods, there are multiple researchers who have made differing estimates. None should be taken as exact numbers, and further context and detail is available by following links to the full description on Wikipedia as well as links to the original information sources.

^†including what is today the Kingdom of Jordan

🔗 Novels 🔗 Novels/Science fiction 🔗 LGBT studies 🔗 Novels/Short story

" '—All You Zombies—' " is a science fiction short story by American writer Robert A. Heinlein. It was written in one day, July 11, 1958, and first published in the March 1959 issue of Fantasy and Science Fiction magazine after being rejected by Playboy.

The story involves a number of paradoxes caused by time travel. In 1980, it was nominated for the Balrog Award for short fiction.

"'—All You Zombies—'" further develops themes explored by the author in a previous work: "By His Bootstraps", published some 18 years earlier. Some of the same elements also appear later in The Cat Who Walks Through Walls (1985), including the Circle of Ouroboros and the Temporal Corps.

The unusual title of the story, which includes both the quotation marks and dashes shown above, is a quotation from a sentence near the end of the story; the quotation is taken from the middle of the sentence, hence the dashes indicating edited text before and after the title.

🔗 Biography 🔗 Germany 🔗 Military history 🔗 Women's History 🔗 Military history/Military biography 🔗 Biography/military biography 🔗 Military history/World War II 🔗 Military history/German military history 🔗 Biography/politics and government 🔗 Anti-war 🔗 Lutheranism 🔗 Pritzker Military Library 🔗 Military history/European military history 🔗 Germany/Munich

Sophia Magdalena Scholl (9 May 1921 – 22 February 1943) was a German student and anti-Nazi political activist, active within the White Rose non-violent resistance group in Nazi Germany.

She was convicted of high treason after having been found distributing anti-war leaflets at the University of Munich (LMU) with her brother, Hans. For her actions, she was executed by guillotine. Since the 1970s, Scholl has been extensively commemorated for her anti-Nazi resistance work.

🔗 Death 🔗 Law 🔗 Lists 🔗 Crime and Criminal Biography

A botched execution is defined by political science professor Austin Sarat as:

Botched executions occur when there is a breakdown in, or departure from, the 'protocol' for a particular method of execution. The protocol can be established by the norms, expectations, and advertised virtues of each method or by the government’s officially adopted execution guidelines. Botched executions are 'those involving unanticipated problems or delays that caused, at least arguably, unnecessary agony for the prisoner or that reflect gross incompetence of the executioner.' Examples of such problems include, among other things, inmates catching fire while being electrocuted, being strangled during hangings (instead of having their necks broken), and being administered the wrong dosages of specific drugs for lethal injections.

🔗 Computing

Koomey's law describes a trend in the history of computing hardware: for about a half-century, the number of computations per joule of energy dissipated doubled about every 1.57 years. Professor Jonathan Koomey described the trend in a 2010 paper in which he wrote that "at a fixed computing load, the amount of battery you need will fall by a factor of two every year and a half."

This trend had been remarkably stable since the 1950s (R² of over 98%). But in 2011, Koomey re-examined this data and found that after 2000, the doubling slowed to about once every 2.6 years. This is related to the slowing of Moore's Law, the ability to build smaller transistors; and the end around 2005 of Dennard scaling, the ability to build smaller transistors with constant power density.

"The difference between these two growth rates is substantial. A doubling every year and a half results in a 100-fold increase in efficiency every decade. A doubling every two and a half years yields just a 16-fold increase", Koomey wrote.

🔗 Archaeology 🔗 Indigenous peoples of North America

The Solutrean hypothesis on the peopling of the Americas claims that the earliest human migration to the Americas took place from Europe, with Solutreans traveling along pack ice in the Atlantic Ocean. This hypothesis contrasts with the mainstream academic narrative that the Americas were first populated by people crossing the Bering Strait to Alaska by foot on what was land during the Last Glacial Period or by following the Pacific coastline from Asia to America by boat.

The Solutrean hypothesis posits that around 21,000 years ago a group of people from the Solutré region of France, who are historically characterized by their unique lithic technique, migrated to North America along pack ice in the Atlantic Ocean. Once they made it to North America, their lithic technique dispersed around the continent (c. 13,000 years ago) to provide the basis for the later popularization of Clovis lithic technology. The premise behind the Solutrean Hypothesis is that the similarities between Clovis and Solutrean lithic technologies are evidence that the Solutreans were the first people to migrate to the Americas, dating far before mainstream scientific theories of the peopling of the Americas.

Originally proposed in the 1970s, the theory has received some support in the 2010s, notably by Dennis Stanford of the Smithsonian Institution and Bruce Bradley of the University of Exeter. However, according to David Meltzer, "[f]ew if any archaeologists—or, for that matter, geneticists, linguists, or physical anthropologists—take seriously the idea of a Solutrean colonization of America." The evidence for the hypothesis is considered more consistent with other scenarios. In addition to an interval of thousands of years between the Clovis and Solutrean eras, the two technologies show only incidental similarities. There is no evidence for any Solutrean seafaring, far less for any technology that could take humans across the Atlantic in an ice age. Genetic evidence supports the theory of Asian, not European, origins for the peopling of the Americas.

🔗 Mathematics

The 15-puzzle (also called Gem Puzzle, Boss Puzzle, Game of Fifteen, Mystic Square and many others) is a sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missing. The puzzle also exists in other sizes, particularly the smaller 8-puzzle. If the size is 3×3 tiles, the puzzle is called the 8-puzzle or 9-puzzle, and if 4×4 tiles, the puzzle is called the 15-puzzle or 16-puzzle named, respectively, for the number of tiles and the number of spaces. The object of the puzzle is to place the tiles in order by making sliding moves that use the empty space.

The n-puzzle is a classical problem for modelling algorithms involving heuristics. Commonly used heuristics for this problem include counting the number of misplaced tiles and finding the sum of the taxicab distances between each block and its position in the goal configuration. Note that both are admissible, i.e. they never overestimate the number of moves left, which ensures optimality for certain search algorithms such as A*.