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🔗 Aviation 🔗 Sweden 🔗 Travel and Tourism 🔗 Travel and Tourism/Hotels

The Jumbo Stay (formerly named the Jumbo Hostel) is a hostel located inside a decommissioned Boeing 747-200 jetliner at Stockholm Arlanda Airport. It opened in 2009.

🔗 Lists

The following article lists the indebted companies in the world by total corporate debt according estimates by the British-Australian investment firm Janus Henderson. In 2019, the total debt of the 900 most indebted companies was $8,325 billion. The most indebted companies were in the oil and gas, utilities, telecommunication and automotive industries. The word's most indebted company in 2019 was Volkswagen AG.

🔗 Software 🔗 Software/Computing

GNU Guix System or Guix System (previously GuixSD) is a rolling release, free and open source Linux distribution built around the GNU Guix package manager. It enables a declarative operating system configuration and allows reliable system upgrades that can easily be rolled back. It uses the GNU Shepherd init system and the Linux-libre kernel, with support for the GNU Hurd kernel under development. On February 3, 2015, the distribution was added to the Free Software Foundation's list of free Linux distributions. The Guix package manager and the Guix System drew inspiration from the Nix package manager and NixOS respectively.

🔗 Architecture 🔗 Psychology 🔗 Sociology 🔗 Correction and Detention Facilities 🔗 Urban studies and planning 🔗 Hospitals

The Kirkbride Plan was a system of mental asylum design advocated by American psychiatrist Thomas Story Kirkbride (1809–1883) in the mid-19th century. The asylums built in the Kirkbride design, often referred to as Kirkbride Buildings (or simply Kirkbrides), were constructed during the mid-to-late-19th century in the United States. The structural features of the hospitals as designated by Kirkbride were contingent on his theories regarding the healing of the mentally ill, in which environment and exposure to natural light and air circulation were crucial. The hospitals built according to the Kirkbride Plan would adopt various architectural styles, but had in common the "bat wing" style floor plan, housing numerous wings that sprawl outward from the center.

The first hospital designed under the Kirkbride Plan was the Trenton State Hospital in Trenton, New Jersey, constructed in 1848. Throughout the remainder of the nineteenth century, numerous psychiatric hospitals were designed under the Kirkbride Plan across the United States. By the twentieth century, popularity of the design had waned, largely due to the economic pressures of maintaining the immense facilities, as well as contestation of Kirkbride's theories amongst the medical community.

Numerous Kirkbride structures still exist, though many have been demolished or partially-demolished and repurposed. At least 30 of the original Kirkbride buildings have been registered with the National Register of Historic Places in the United States, either directly or through their location on hospital campuses or in historic districts.

🔗 Physics 🔗 Physics/relativity

The Gödel metric is an exact solution of the Einstein field equations in which the stress–energy tensor contains two terms, the first representing the matter density of a homogeneous distribution of swirling dust particles (dust solution), and the second associated with a negative cosmological constant (see lambdavacuum solution). It is also known as the Gödel solution or Gödel universe.

This solution has many unusual properties—in particular, the existence of closed timelike curves that would allow time travel in a universe described by the solution. Its definition is somewhat artificial in that the value of the cosmological constant must be carefully chosen to match the density of the dust grains, but this spacetime is an important pedagogical example.

This solution was found in 1949 by Kurt Gödel.

🔗 United States 🔗 Disaster management 🔗 Crime 🔗 Death 🔗 Lists 🔗 Politics 🔗 Politics/American politics 🔗 Years 🔗 United States/U.S. history 🔗 Current events 🔗 Politics/Gun politics

This is a list of shootings in the United States that have occurred in 2022. Mass shootings are incidents involving several victims of firearm-related violence. The precise inclusion criteria are disputed, and there is no broadly accepted definition.

Gun Violence Archive, a nonprofit research group, run by Tracy Holtan, that tracks shootings and their characteristics in the United States, defines a mass shooting as an incident in which four or more people, excluding the perpetrator(s), are shot in one location at roughly the same time. The Congressional Research Service narrows that definition, limiting it to "public mass shootings", defined by four or more victims killed, excluding any victims who survive. The Washington Post and Mother Jones use similar definitions, with the latter acknowledging that their definition "is a conservative measure of the problem", as many shootings with fewer fatalities occur. The crowdsourced Mass Shooting Tracker project has the most expansive definition of four or more shot in any incident, including the perpetrator in the victim inclusion criteria.

A 2019 study of mass shootings published in the journal Injury Epidemiology recommended developing "a standard definition that considers both fatalities and nonfatalities to most appropriately convey the burden of mass shootings on gun violence." The authors of the study further suggested that "the definition of mass shooting should be four or more people, excluding the shooter, who are shot in a single event regardless of the motive, setting or number of deaths."

🔗 United States 🔗 Disaster management 🔗 Crime 🔗 Lists 🔗 Politics 🔗 Schools 🔗 Politics/American politics 🔗 United States/U.S. history 🔗 Politics/Gun politics

This chronological list of school shootings in the United States includes any school shootings that occurred at a K-12 public or private school, as well as at colleges and universities, and on school buses. Excluded from this list are the following:

1. Incidents that occurred during wars
2. Incidents that occurred as a result of police actions
3. Murder-suicides by rejected suitors or estranged spouses
4. Suicides or suicide attempts involving only one person.

Shootings by school staff, where the only victims are other employees, are covered at workplace killings.

🔗 Biology 🔗 Physics 🔗 Biophysics

Magnetosomes are membranous structures present in magnetotactic bacteria (MTB). They contain iron-rich magnetic particles that are enclosed within a lipid bilayer membrane. Each magnetosome can often contain 15 to 20 magnetite crystals that form a chain which acts like a compass needle to orient magnetotactic bacteria in geomagnetic fields, thereby simplifying their search for their preferred microaerophilic environments. Recent research has shown that magnetosomes are invaginations of the inner membrane and not freestanding vesicles. Magnetite-bearing magnetosomes have also been found in eukaryotic magnetotactic algae, with each cell containing several thousand crystals.

Overall, magnetosome crystals have high chemical purity, narrow size ranges, species-specific crystal morphologies and exhibit specific arrangements within the cell. These features indicate that the formation of magnetosomes is under precise biological control and is mediated biomineralization.

Magnetotactic bacteria usually mineralize either iron oxide magnetosomes, which contain crystals of magnetite (Fe₃O₄), or iron sulfide magnetosomes, which contain crystals of greigite (Fe₃S₄). Several other iron sulfide minerals have also been identified in iron sulfide magnetosomes—including mackinawite (tetragonal FeS) and a cubic FeS—which are thought to be precursors of Fe₃S₄. One type of magnetotactic bacterium present at the oxic-anoxic transition zone (OATZ) of the southern basin of the Pettaquamscutt River Estuary, Narragansett, Rhode Island, United States is known to produce both iron oxide and iron sulfide magnetosomes.

🔗 Iran 🔗 Cities

Ramsar (Persian: رامسر, also Romanized as Rámsar and Ránsar; formerly, Sakht Sar) is the capital of Ramsar County, Mazandaran Province, Iran. In 2012 its population was 33,018, in 9,421 families.

Ramsar lies on the coast of the Caspian Sea. It was also known as Sakhtsar in the past. The climate of Ramsar is hot and humid in summer and mild in winter. The proximity of the forest and the sea in this city has given a special beauty to this city and this attracts tourists in all seasons. Ramsar has an airport. The city of Ramsar was a small village in western Mazandaran until the Qajar period, and during the first Pahlavi period, with the rule of Reza Shah and with the support of the government, it became a beautiful city with many tourist facilities.

Ramsar is the westernmost county and city in Mazandaran. It borders the Caspian Sea to the north, Gilan province to the west, Qazvin Province to the south, and Tonekabon to the east.