Summary

HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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Nationalism in the Middle Ages
Theories on the existence of nationalism in the Middle Ages may belong to the general paradigms of ethnosymbolism and primordialism or perennialism. Several scholars of nationalism support the existence of nationalism in the Middle Ages (mainly in Europe). This school of thought differs from modernism, which suggests that nationalism developed after the late 18th century and the French Revolution.
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  • 10 Nov 2022
Topic Review
Diverticulosis
Diverticulosis is the condition of having multiple pouches (diverticula) in the colon that are not inflamed. These are outpockets of the colonic mucosa and submucosa through weaknesses of muscle layers in the colon wall, and may be due in part to low-fiber diet prompting changes in intestinal microflora with consequent low-grade inflammation. Diverticula do not cause symptoms in most people. Diverticular disease occurs when diverticula become clinically inflamed, a condition known as diverticulitis. Diverticula typically occur in the sigmoid colon, which is commonplace for increased pressure. The left side of the colon is more commonly affected in the United States while the right side is more commonly affected in Asia. Diagnosis is often during routine colonoscopy or as an incidental finding during CT scan. It is common in Western countries with about half of those over the age of 60 affected in Canada and the United States. Diverticula are uncommon before the age of 40, and increase in incidence beyond that age. Rates are lower in Africa; the reasons for this remain unclear but may involve the greater prevalence of a high fiber diet in contrast with the lower-fiber diet characteristic of many Western populations.
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  • 10 Nov 2022
Topic Review
List of Highest Mountains on Earth
There are at least 108 mountains on Earth with elevations of 7,200 metres (23,622 ft) or greater above sea level. The vast majority of these mountains are located on the edge of the Indian and Eurasian plate- namely, in China , Pakistan , Nepal and India .
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  • 10 Nov 2022
Topic Review
React (Media Franchise)
React (sometimes stylized in all caps as REACT) is a media franchise used by the Fine Brothers consisting of several online series centering on a group of individuals reacting to viral videos, trends, video games, film trailers, or music videos. React was also the first react channel on YouTube. The franchise was launched with the YouTube debut of Kids React in October 2010, and then grew to encompass four more series uploaded on the Fine Brothers' primary YouTube channel, a separate YouTube channel with various reaction-related content, as well as a television series titled React to That. In 2016, the duo announced React World, a program and channel in which they would license the format of their React shows to creators, which led to widespread negative reception from viewers and fellow content creators, as well as confusion about what their format is. This eventually lead to the Fine Brothers to removing all videos related to React World, essentially pulling the plug on the React World program.
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  • 10 Nov 2022
Topic Review
Scarr-Rowe Effect
In behavioral genetics, the Scarr-Rowe effect, also known as the Scarr-Rowe hypothesis, refers to the proposed moderating effect of low socioeconomic status on the heritability of children's IQ. According to this hypothesis, lower socioeconomic status and greater exposure to social disadvantage during childhood leads to a decrease in the heritability of IQ, as compared to children raised in more advantaged environments. It is considered an example of gene–environment interaction. This hypothesized effect was first proposed by Sandra Scarr, who found support for it in a 1971 study of twins in Philadelphia, and these results were replicated by David C. Rowe in 1999. A 2015 meta-analysis found the effect was predominant in the United States while less evident in societies with robust child welfare systems.
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  • 10 Nov 2022
Topic Review
Ecoagriculture
Eco friendly agriculture describes landscapes that support both agricultural production and biodiversity conservation, working in harmony together to improve the livelihoods of rural communities. While many rural communities have independently practiced eco-agriculture for thousands of years, over the past century many of these landscapes have given way to segregated land use patterns, with some areas employing intensive farming practices without regard to biodiversity impacts, and other areas fenced off completely for habitat or watershed protection. A new eco-agriculture movement is now gaining momentum to unite land managers and other stakeholders from diverse environments to find compatible ways to conserve biodiversity while also enhancing agricultural production.
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  • 10 Nov 2022
Topic Review
Energy Accidents
Energy resources bring with them great social and economic promise, providing financial growth for communities and energy services for local economies. However, the infrastructure which delivers energy services can break down in an energy accident, sometimes causing much damage, and energy fatalities can occur, and with many systems often deaths will happen even when the systems are working as intended. Historically, coal mining has been the most dangerous energy activity and the list of historical coal mining disasters is a long one. Underground mining hazards include suffocation, gas poisoning, roof collapse and gas explosions. Open cut mining hazards are principally mine wall failures and vehicle collisions. In the US alone, more than 100,000 coal miners have been killed in accidents over the past century, with more than 3,200 dying in 1907 alone. According to Benjamin K. Sovacool, 279 major energy accidents occurred from 1907 to 2007 and they caused 182,156 deaths with $41 billion in property damages, with these figures not including deaths from smaller accidents. However, by far the greatest energy fatalities that result from energy generation by humanity, is the creation of air pollution. The most lethal of which, particulate matter, which is primarily generated from the burning of fossil fuels and biomass is (counting outdoor air pollution effects only) estimated to cause 2.1 million deaths annually.
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  • 10 Nov 2022
Topic Review
Widow Conservation
Widow conservation was a practice in Protestant Europe in the early modern age, when the widow of a parish vicar (or sometimes her daughter) would marry her husband's successor to the vicarage to ensure her economic support. The practice was common in Scandinavia (Änkekonservering/Enkekonservering) and Protestant parts of Germany (Konservierung von Pfarrwitwen). It is related to other forms of widow inheritance, including the levirate marriage known in the Old Testament as yibbum. At the introduction of the Protestant Reformation, priests were allowed to marry. However, as they did not own the vicarage and property attached to their profession, their wife and children were left without a home and means of support after their death. The future support of the widows and children of vicars thereby became a concern for the various churches. The most common solution was for the successor of a vicar to be required to marry the widow (or perhaps her daughter) of his predecessor, thereby "conserving" her.
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Topic Review
Virtual Breakdown Mechanism
The Virtual breakdown mechanism is a concept in the field of electrochemistry. In electrochemical reactions, when the cathode and the anode are close enough to each other (i.e., so-called "nanogap electrochemical cells"), the double layer the regions from the two electrodes is overlapped, forming a large electric field uniformly distributed inside the entire electrode gap. Such high electric fields can significantly enhance the ion migration inside bulk solutions and thus increase the entire reaction rate, akin to the "breakdown" of the reactant(s). However, it is fundamentally different from the traditional "breakdown". The Virtual breakdown mechanism was discovered in 2017 when researchers studied pure water electrolysis based on deep-sub-Debye-length nanogap electrochemical cells. Furthermore, researchers found the relation of the gap distance between cathodes and anodes to the performance of electrochemical reactions.
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  • 10 Nov 2022
Biography
Margaret Hamilton
Margaret Heafield Hamilton (born Heafield on August 17, 1936)[1] is an American computer scientist, systems engineer, and business owner. She is credited with coining the term, "software engineering". Hamilton was Director of the Software Engineering Division[2] of the MIT Instrumentation Laboratory, which developed on-board flight software for the Apollo space program.[3] In 1986, she became th
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