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🔗 History of Science 🔗 Tree of Life

The species problem is the set of questions that arises when biologists attempt to define what a species is. Such a definition is called a species concept; there are at least 26 recognized species concepts. A species concept that works well for sexually reproducing organisms such as birds is useless for species that reproduce asexually, such as bacteria. The scientific study of the species problem has been called microtaxonomy.

One common, but sometimes difficult, question is how best to decide which species an organism belongs to, because reproductively isolated groups may not be readily recognizable, and cryptic species may be present. There is a continuum from reproductive isolation with no interbreeding, to panmixis, unlimited interbreeding. Populations can move forward or backwards along this continuum, at any point meeting the criteria for one or another species concept, and failing others.

Many of the debates on species touch on philosophical issues, such as nominalism and realism, and on issues of language and cognition.

The current meaning of the phrase "species problem" is quite different from what Charles Darwin and others meant by it during the 19th and early 20th centuries. For Darwin, the species problem was the question of how new species arose. Darwin was however one of the first people to question how well-defined species are, given that they constantly change.

🔗 Biography 🔗 Computing 🔗 London 🔗 Philosophy 🔗 Philosophy/Logic 🔗 Business 🔗 England 🔗 Biography/science and academia 🔗 Philosophy/Philosophers 🔗 Philately 🔗 Biography/Core biographies

Charles Babbage (; 26 December 1791 – 18 October 1871) was an English polymath. A mathematician, philosopher, inventor and mechanical engineer, Babbage originated the concept of a digital programmable computer.

Considered by some to be a father of the computer, Babbage is credited with inventing the first mechanical computer that eventually led to more complex electronic designs, though all the essential ideas of modern computers are to be found in Babbage's Analytical Engine. His varied work in other fields has led him to be described as "pre-eminent" among the many polymaths of his century.

Parts of Babbage's incomplete mechanisms are on display in the Science Museum in London. In 1991, a functioning difference engine was constructed from Babbage's original plans. Built to tolerances achievable in the 19th century, the success of the finished engine indicated that Babbage's machine would have worked.

🔗 Biography 🔗 Hungary 🔗 Women writers 🔗 Translation studies

Kató Lomb (Pécs, February 8, 1909 – Budapest, June 9, 2003) was a Hungarian interpreter, translator and one of the first simultaneous interpreters in the world. Originally she graduated in physics and chemistry, but her interest soon led her to languages. Native in Hungarian, she was able to interpret fluently in nine or ten languages (in four of them even without preparation), and she translated technical literature and read belles-lettres in six languages.She was able to understand journalism in further eleven languages. As she put it, altogether she earned money with sixteen languages (Bulgarian, Chinese, Danish, English, French, German, Hebrew, Italian, Japanese, Latin, Polish, Romanian, Russian, Slovak, Spanish, Ukrainian). She learned these languages mostly by self-effort, as an autodidact. Her aims to acquire these languages were most of all practical, to satisfy her interest.

According to her own account, her long life was highlighted not primarily by the command of languages but the actual study of them. Through her books, published in Hungarian in several editions as well as in some other languages, interviews (in print and on the air) and conversations, she tried to share this joy with generations. As an interpreter, she visited five continents, saw forty countries, and reported about her experiences and adventures in a separate book (Egy tolmács a világ körül, "An interpreter around the world").

🔗 Lists

This is a list of countries and territories by home ownership rate, which is the ratio of owner-occupied units to total residential units in a specified area.

🔗 Typography 🔗 Industrial design

The IBM Selectric typewriter was a highly successful line of electric typewriters introduced by IBM on 31 July 1961.

Instead of the "basket" of individual typebars that swung up to strike the ribbon and page in a typical typewriter of the period, the Selectric had an "element" (frequently called a "typeball", or less formally, a "golf ball") that rotated and pivoted to the correct position before striking. The element could be easily changed so as to use different fonts in the same document typed on the same typewriter, resurrecting a capability that had been pioneered by typewriters such as the Hammond and Blickensderfer in the late 19th century. The Selectric also replaced the traditional typewriter's horizontally moving carriage with a roller (platen) that turned to advance the paper but did not move horizontally, while the typeball and ribbon mechanism did.

The Selectric mechanism was notable for using internal mechanical binary coding and two mechanical digital-to-analog converters, called whiffletree linkages, to select the character to be typed.

Selectrics and their descendants eventually captured 75 percent of the United States market for electric typewriters used in business. IBM replaced the Selectric line with the IBM Wheelwriter in 1984 and transferred its typewriter business to the newly formed Lexmark in 1991. By its 25th anniversary, in 1986, a total of more than 13 million machines were made and sold.

🔗 United Kingdom 🔗 Education 🔗 Science

The Nuffield Science Teaching Project was a programme to develop a better approach to teaching science in British secondary schools, under the auspices of the Nuffield Foundation. Although not intended as a curriculum, it gave rise to alternative national examinations, and its use of discovery learning was influential in the 1960s and 1970s.

🔗 Finance & Investment 🔗 New York City 🔗 Fraternities and Sororities

Kappa Beta Phi (ΚΒΦ) is a secret society with at least one surviving chapter, based on Wall Street in New York City, that is made up of high-ranking financial executives. The purpose of the organization today is largely social and honorific. The current honor society meets once a year at a black-tie dinner to induct new members.

🔗 Internet 🔗 Computing 🔗 Marketing & Advertising 🔗 Computing/Software 🔗 Computing/Computer Security 🔗 Israel

Download Valley is a cluster of software companies in Israel, producing and delivering adware to be installed alongside downloads of other software. The primary purpose is to monetize shareware and downloads. These software items are commonly browser toolbars, adware, browser hijackers, spyware, and malware. Another group of products are download managers, possibly designed to induce or trick the user to install adware, when downloading a piece of desired software or mobile app from a certain source.

Although the term references Silicon Valley, it does not refer to a specific valley or any geographical area. Many of the companies are located in Tel Aviv and the surrounding region. It has been used by Israeli media as well as in other reports related to IT business.

Download managers from Download Valley companies have been used by major download portals and software hosts, including Download.com by CNET, Softonic.com and SourceForge.

🔗 Biography 🔗 Polynesia 🔗 Australia 🔗 Canada 🔗 New Zealand 🔗 Politics 🔗 Women 🔗 Biography/Royalty and Nobility 🔗 Women's History 🔗 United Kingdom 🔗 Biography/politics and government 🔗 Politics of the United Kingdom 🔗 South Africa 🔗 Zimbabwe 🔗 Caribbean 🔗 Melanesia 🔗 Scouting/Girl Guiding and Girl Scouting 🔗 Scouting 🔗 Current events 🔗 Malta 🔗 Commonwealth 🔗 Caribbean/Jamaica 🔗 Canada/Political parties and politicians in Canada 🔗 Polynesia/Niue 🔗 Caribbean/Antigua and Barbuda 🔗 Caribbean/Bahamas 🔗 Zimbabwe/Rhodesia 🔗 Polynesia/Cook Islands 🔗 Caribbean/Saint Kitts and Nevis 🔗 Polynesia/Tuvalu 🔗 Belize 🔗 Melanesia/Solomon Islands 🔗 Caribbean/Barbados 🔗 Grenada 🔗 Canada/Governments of Canada 🔗 Caribbean/Saint Lucia 🔗 Caribbean/Saint Vincent and the Grenadines 🔗 British Royalty 🔗 Melanesia/Papua New Guinea

Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 September 2022) was Queen of the United Kingdom from 6 February 1952 until her death in 2022. Her reign of 70 years and 214 days was the longest of any British monarch and the second-longest recorded of any monarch of a sovereign country. At the time of her death, Elizabeth was queen of 14 other Commonwealth realms in addition to the UK.

Elizabeth was born in Mayfair, London, as the first child of the Duke and Duchess of York (later King George VI and Queen Elizabeth). Her father acceded to the throne in 1936 upon the abdication of his brother, King Edward VIII, making Elizabeth the heir presumptive. She was educated privately at home and began to undertake public duties during the Second World War, serving in the Auxiliary Territorial Service. In November 1947, she married Philip Mountbatten, a former prince of Greece and Denmark, and their marriage lasted 73 years until his death in April 2021. They had four children together: Charles III; Anne, Princess Royal; Prince Andrew, Duke of York; and Prince Edward, Earl of Wessex.

When her father died in February 1952, Elizabeth—then 25 years old—became queen regnant of seven independent Commonwealth countries: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan, and Ceylon (known today as Sri Lanka), as well as Head of the Commonwealth. Elizabeth reigned as a constitutional monarch through major political changes such as the Troubles in Northern Ireland, devolution in the United Kingdom, the decolonisation of Africa, and the United Kingdom's accession to the European Communities and withdrawal from the European Union. The number of her realms varied over time as territories have gained independence and some realms have become republics. Her many historic visits and meetings include state visits to China in 1986, Russia in 1994, the Republic of Ireland in 2011, and visits with five Popes.

Significant events include Elizabeth's coronation in 1953 and the celebrations of her Silver, Golden, Diamond, and Platinum Jubilees in 1977, 2002, 2012, and 2022, respectively. Elizabeth was the longest-lived and longest-reigning British monarch, and the second-longest verifiable reigning sovereign monarch in world history, only behind Louis XIV of France. She faced occasional republican sentiment and media criticism of her family, particularly after the breakdowns of her children's marriages, her annus horribilis in 1992, and the death of her former daughter-in-law Diana, Princess of Wales, in 1997. However, support for the monarchy in the United Kingdom remained consistently high, as did her personal popularity. Elizabeth died on 8 September 2022 at Balmoral Castle, Aberdeenshire. She was succeeded by her eldest son, Charles III.

🔗 Computing 🔗 Caribbean 🔗 Caribbean/Aruba 🔗 Caribbean/Curaçao 🔗 Caribbean/Caribbean Netherlands

.an was the Internet country code top-level domain (ccTLD) for the former Netherlands Antilles. It was administered by the University of the Netherlands Antilles. The domain was phased out after the Netherlands Antilles were dissolved in 2010. As of November 2010 the .an domain remained live with over 800 domains registered under .an, including secondary levels. On 31 July 2015, use of the domain was discontinued.