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🔗 Military history 🔗 Disaster management 🔗 Death 🔗 China/Chinese history 🔗 China 🔗 Astronomy 🔗 Geology 🔗 Military history/Asian military history 🔗 Geology/Meteorites 🔗 Military history/Chinese military history 🔗 Explosives 🔗 Astronomy/Solar System

The Wanggongchang Explosion (Chinese: 王恭廠大爆炸), also known as the Great Tianqi Explosion (天啟大爆炸), Wanggongchang Calamity (王恭廠之變) or Beijing Explosive Incident in Late Ming (晚明北京爆炸事件), was an unexplained catastrophic explosion that occurred on May 30 of the Chinese calendar in 1626 AD during the late reign of Tianqi Emperor, at the heavily populated Ming China capital Beijing, and had reportedly killed around 20,000 people. The nature of the explosion is still unclear to this day, as it is estimated to have released energy equivalent to about 10-20 kiloton of TNT, similar to that of the Hiroshima bombing.

🔗 Biography 🔗 Mathematics 🔗 Astronomy 🔗 Japan 🔗 Japan/Science and technology 🔗 Japan/Biography

Seki Takakazu (関 孝和, 1642 – December 5, 1708), also known as Seki Kōwa (関 孝和), was a Japanese mathematician and author of the Edo period.

Seki laid foundations for the subsequent development of Japanese mathematics known as wasan; and he has been described as "Japan's Newton".

He created a new algebraic notation system and, motivated by astronomical computations, did work on infinitesimal calculus and Diophantine equations. A contemporary of German polymath mathematician and philosopher Gottfried Leibniz and British mathematician Isaac Newton, Seki's work was independent. His successors later developed a school dominant in Japanese mathematics until the end of the Edo period.

While it is not clear how much of the achievements of wasan are Seki's, since many of them appear only in writings of his pupils, some of the results parallel or anticipate those discovered in Europe. For example, he is credited with the discovery of Bernoulli numbers. The resultant and determinant (the first in 1683, the complete version no later than 1710) are attributed to him. These achievements are astonishing, considering that Japanese mathematics before his appearance was at such a primitive stage. For example, comprehensive introduction of 13th century Chinese algebra was made as late as 1671, by Kazuyuki Sawaguchi.

🔗 Canada 🔗 Canada/History of Canada 🔗 Canada/Geography of Canada 🔗 Canada/Canadian Territories

The High Arctic relocation (French: La délocalisation du Haut-Arctique, Inuktitut syllabics: ᖁᑦᑎᒃᑐᒥᐅᑦᑕ ᓅᑕᐅᓂᖏᑦ Inuktitut: Quttiktumut nuutauningit) took place during the Cold War in the 1950s, when 92 Inuit were moved by the Government of Canada to the High Arctic.

The relocation has been a source of controversy: on one hand being described as a humanitarian gesture to save the lives of starving indigenous people and enable them to continue a subsistence lifestyle; and on the other hand, said to be a forced migration instigated by the federal government to assert its sovereignty in the Far North by the use of "human flagpoles", in light of both the Cold War and the disputed territorial claims to the Canadian Arctic Archipelago. Both sides acknowledge that the relocated Inuit were not given sufficient support to prevent extreme privation during their first years after the move. The story was the subject of a book called The Long Exile, published by Melanie McGrath in 2006.

Mass amateurization refers to the capabilities that new forms of media have given to non-professionals and the ways in which those non-professionals have applied those capabilities to solve problems (e.g. create and distribute content) that compete with the solutions offered by larger, professional institutions. Mass amateurization is most often associated with Web 2.0 technologies. These technologies include the rise of blogs and citizen journalism, photo and video-sharing services such as Flickr and YouTube, user-generated wikis like Wikipedia, and distributed accommodation services such as Airbnb. While the social web is not the only technology responsible for the rise of mass amateurization, Clay Shirky claims Web 2.0 has allowed amateurs to undertake increasingly complex tasks resulting in accomplishments that would seem daunting within the traditional institutional model.

In addition to whole websites and applications, Web 2.0 has also birthed a variety of digital tools that facilitate organization and problem solving on a large scale. These tools include tags, trackbacks, and hashtags. These new forms of media became widely available during the first decade of the 21st century due in part to the fall of transactional costs of creating and distributing media. Mass amateurization is a social, cumulative and collaborative activity, wherein ideas will flow back up the pipeline from consumers and they will share them among themselves.

There is no institutional hierarchy in mass amateurization. There is only an informal group of collaborators working to solve a problem. Due to mass amateurization, amateurs are able to collaborate without the interference from the inherent obstacles associated with institutions. These obstacles include the costs that an institution incurs while educating, training, directing, coaching, advising, and organizing its members.

🔗 International relations 🔗 Lists 🔗 Countries

This is a list of purchases of territory by a sovereign nation from another sovereign nation.

🔗 United States 🔗 Companies 🔗 Retailing 🔗 Home Living 🔗 United States/Nebraska - Omaha

Nebraska Furniture Mart is the largest home furnishing store in North America selling furniture, flooring, appliances and electronics. NFM was founded in 1937 by Belarus-born Rose Blumkin, universally known as Mrs. B., in Omaha, Nebraska, United States. Under the motto "sell cheap and tell the truth," she worked in the business until age 103. In 1983, Mrs. B. sold a majority interest to Berkshire Hathaway in a handshake deal with Warren Buffett.

🔗 Africa 🔗 Highways 🔗 Highways/Road transport 🔗 Highways/African Highways

The Trans-African Highway network comprises transcontinental road projects in Africa being developed by the United Nations Economic Commission for Africa (UNECA), the African Development Bank (ADB), and the African Union in conjunction with regional international communities. They aim to promote trade and alleviate poverty in Africa through highway infrastructure development and the management of road-based trade corridors. The total length of the nine highways in the network is 56,683 km (35,221 mi).

In some documents the highways are referred to as "Trans-African Corridors" or "Road Corridors" rather than highways. The name Trans-African Highway and its variants are not in wide common usage outside of planning and development circles, and as of 2014 one does not see them signposted as such or labelled on maps, except in Kenya and Uganda where the Mombasa–Nairobi–Kampala–Fort Portal section (or the Kampala–Kigali feeder road) of Trans-African Highway 8 is sometimes referred to as the "Trans-Africa Highway".

🔗 Computing 🔗 Computer Security 🔗 Computer Security/Computing

A zip bomb, also known as a zip of death or decompression bomb, is a malicious archive file designed to crash or render useless the program or system reading it. It is often employed to disable antivirus software, in order to create an opening for more traditional viruses.

Rather than hijacking the normal operation of the program, a zip bomb allows the program to work as intended, but the archive is carefully crafted so that unpacking it (e.g. by a virus scanner in order to scan for viruses) requires inordinate amounts of time, disk space or memory.

Most modern antivirus programs can detect whether a file is a zip bomb, to avoid unpacking it.