control group | Definition, Examples, & Facts | Britannica

control group | Definition, Examples, & Facts | Britannica

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control group | Definition, Examples, & Facts | Britannica

Control group, the standard to which comparisons are made in an experiment. ... to have an effect on the outcome of interest while the control group is not. ... a gravitational field that pulled the ball down or because a cable was yanking the ...

poetry | Definition, Types, Terms, Examples, & Facts | Britannica

Poems hanging from an outdoor poetry line during the annual International ... Christiane St-Pierre, Festival International de la Poesie. Poetry ... books of science, philosophy, theology—have gone down, deservedly or not, into dust and silence.

Control Group - Definition and Examples | Biology Dictionary

28 Apr 2017 ... Human spit contains the enzyme amylase, which breaks down ... In the control group, a beaker is filled with starch and iodine, but no enzyme.

electron | Definition, Mass, & Facts | Britannica

A moving body keeps moving not because of its inertia but only because of the absence of a force to slow it down, change its course, or speed it up. Read More ...

slavery | Definition, History, & Facts | Britannica

28 Jul 2020 ... There is no consensus on what a slave was or on how the institution of ... Slavery continued to be a feature of Chinese society down to the 20th ...

Wikipedia | Definition, History, & Facts | Britannica

Whether or not Wikipedia can solve these demographic problems, it has undoubtedly ... This set off the so-called “UNIX wars” among minicomputer enthusiasts.

Pangea | Definition, Map, History, & Facts | Britannica

Cathaysia, a landmass comprising the former tectonic plates of North and South China, was not incorporated into Pangea. Rather, it formed a separate, much ...

Andes Mountains | Definition, Map, Location, & Facts | Britannica

The Andes are not a single line of formidable peaks but rather a succession of ... of the Peru-Chile (Atacama) Trench off the Pacific coast of the continent and the ...

Futurism | Definition, Manifesto, Artists, & Facts | Britannica

Although they were not yet working in what was to become the Futurist style, the group ... represented Marinetti's demands for a pared-down elliptical language, ...

secession| History, Definition, Crisis, & Facts | Britannica

Secession, the withdrawal of 11 slave states (states in which slaveholding ... the territories should remain free; i.e., slaveholding should not be permitted in them. ... central government when the rebellion had been put down, and that therefore ...

Reconquista | Definition, History, Significance, & Facts | Britannica

The Reconquest might have taken root at that earlier date had it not been for a resurgence ... At that time, Moorish unity broke down, and the Christian lands of northern Spain ... Alfonso IAlfonso I, sculpture in the Paseo de la Argentina, Madrid.

literature | Definition, Scope, Types, & Facts | Britannica

But not everything expressed in words—even when organized and written down—is counted as literature. Those writings that are primarily informative—technical, ...

billiards | Definition, Games, Rules, & Facts | Britannica

Billiards, any of various games played on a rectangular table with a ... Carom, or French, billiards is played with three balls on a table that has no pockets. ... to the cue tip permitting the players to strike the cue ball off centre on purpose in ... in the United States and has many players in Japan, Indonesia, the Philippines, ...

Eastern Orthodoxy | Definition, Origin, History, & Facts | Britannica

Eastern Orthodoxy, one of the three major doctrinal and jurisdictional groups of Christianity. ... Theological differences could have been settled if the two areas had not simultaneously developed different ... Get 30% your subscription today.

Mekong River | Facts, Definition, Map, History, & Location | Britannica

Mekong River, the longest river in Southeast Asia, 7th longest in Asia, and 12th longest in the ... The river then flows through Laos, Cambodia, and Vietnam before draining into the South ... Which of these does not border India? ... the southwest, sediment carried down from the upper river is in the process of being deposited ...

AK-47 | Definition, History, & Operation | Britannica

... or no license at all. A full range of weapons that can trace their design history back to the AK-47 are produced by the Izhmash armaments company in Izhevsk, ...

Mercator projection | Definition, Uses, & Limitations | Britannica

The Mercator projection is a useful navigation tool, as a straight line on a Mercator map indicates a straight course, but it is not a practical world map, because of ...

bone formation | Definition & Physiology | Britannica

Bone formation, process by which new bone is produced. ... Soon after the osteoid is laid down, inorganic salts are deposited in it to form the hardened ... The flat bones of the skull are not preformed in cartilage like compact bone but begin as ...

Down syndrome | Definition, Types, Symptoms ... - Britannica

A parent who possesses a balanced translocation—a chromosome rearrangement with no extra genetic material from chromosome 21—can pass the ...

J.P. Morgan | Biography & Facts | Britannica

J.P. Morgan, in full John Pierpont Morgan, (born April 17, 1837, Hartford, ... Morgan had intimate and highly useful connections with the London financial world, ...

Pompeii | Facts, Map, & Ruins | Britannica

Pompeii, preserved ancient Roman city in Campania, Italy, that was destroyed ... The cities had not yet recovered from this catastrophe when final destruction ... and other volcanic debris began pouring down on Pompeii, quickly covering the ...

Lisbon Treaty | History, Summary, & Definition of Article 50 | Britannica

History of the Lisbon Treaty, the foundational agreement of the European Union. ... announced that he would step down, and EU officials stated that no formal or ...

Leonardo da Vinci | Biography, Art, & Facts | Britannica

Leonardo da Vinci, Italian painter, draftsman, sculptor, architect, and engineer whose ... Leonardo did not seriously study Latin, the key language of traditional ... sought his advice on how to ward off a threatened Turkish incursion in Friuli.

Asia | History, Countries, Map, & Facts | Britannica

The islands—including Taiwan, those of Japan and Indonesia, Sakhalin and other ... subcontinent broke off from Africa and began drifting northeastward to collide ... The mountain systems of Central Asia not only have provided the continent's ...

Kazakhstan | History, People, Map, & Facts | Britannica

While Kazakhstan was not considered by authorities in the former Soviet ... Very fertile soils characterize the lands from far northern Kazakhstan down to the ...

Arab | Description, History, & Facts | Britannica

In modern usage, it embraces any of the Arabic-speaking peoples living in the ... Arabs of today, however, are not exclusively Muslim; approximately 5 percent of ... Arabs live in cities and towns, where family and tribal ties tend to break down, ...

Italo-Ethiopian War | Causes, Summary, & Facts | Britannica

Italo-Ethiopian War, an armed conflict in 1935–36 that resulted in Ethiopia's ... League of Nations when League decisions were not supported by the great powers. ... in which statues of Mussolini were torn down, Fascist symbols removed, and ...

The Four Seasons | Arrangement, Composer, & Facts | Britannica

24 Jul 2020 ... The Four Seasons, group of four violin concerti by Italian composer ... Spring (Concerto No. ... To go in haste, slide, and fall down to the ground, ... signing up for this email, you are agreeing to news, offers, and information from ...

Deng Xiaoping | Biography & Facts | Britannica

Deng Xiaoping, Chinese communist leader who was the most powerful figure in China ... It was not until Mao's death in September 1976 and the consequent fall from ... In 1987 Deng stepped down from the CCP's Central Committee, thereby ...

Palace of Versailles | History & Facts | Britannica

Versailles, Palace ofThe Marble Court at the Palace of Versailles, France. ... Landscape artist André Le Nôtre created symmetrical French gardens that included ... North of the terrace, manicured ornamental gardens slope gently down to the ...

The City of God | Summary, Significance, & Facts | Britannica

Augustine asserted that Christians' credibility was dependent on their not being ... and one sister, he seems to have been the only child sent off to be educated.

A.P.J. Abdul Kalam | Biography & Facts | Britannica

23 Jul 2020 ... A.P.J. Abdul Kalam, Indian scientist and politician who was president of ... Unlike scientists, engineers are not free to select the problems that ...

Mount Fuji | Facts, Location, & Eruptions | Britannica

Alternative Titles: Fuji no Yama, Fuji-san, Fujisan, Fujiyama ... also spelled Fujisan, also called Fujiyama or Fuji no Yama, highest mountain in Japan. It rises to 12,388 feet (3,776 metres) near the Pacific Ocean coast in Yamanashi ... of central Honshu, about 60 miles (100 km) west of the Tokyo-Yokohama metropolitan area.

Robert Schumann | Biography, Compositions, & Facts | Britannica

25 Jul 2020 ... Robert Schumann, German Romantic composer renowned particularly for ... But at Leipzig his time was devoted not to the law but to song composition, ... Fricken, but long before the engagement was formally broken off (Jan.

Battle of Britain | History, Importance, & Facts | Britannica

Battle of Britain, during World War II, the successful defense of Great Britain ... It was not until July 2 that Hitler even ordered a consideration of the problem of ... phases, the underlying object was always to wear down Britain's air defense, and ...

Rhine River | Location, Length, Map, & Facts | Britannica

Rhine River, German Rhein, French Rhin, Dutch Rijn, Celtic Renos, Latin Rhenus, river ... Flow down the Rhine River to Wagner's Die Walküre and take in the valley's waterfalls ... No other river in the world has so many old and famous cities on its ... Downstream, the regulated Neckar, after crossing the Oden uplands in a ...

Pablo Escobar | Biography, Death, & Facts | Britannica

Pablo Escobar, Colombian criminal who, as head of the Medellin cartel, was ... Not only did the facility include a nightclub, sauna, waterfall, and soccer field, it also ... The euphoric effects of sniffing cocaine are relatively transitory and wear off ...

Antoine Lavoisier | Biography, Discoveries, & Facts | Britannica

Antoine Lavoisier, prominent French chemist and leading figure in the ... as a student was not a subject particularly noted for conceptual clarity or theoretical rigour. ... Noting that burning gives off light and heat, that warm-blooded animals ...

Gottfried Wilhelm Leibniz | Biography & Facts | Britannica

27 Jun 2020 ... Gottfried Wilhelm Leibniz, German philosopher, mathematician, and political ... Leibniz dreamed of reconciling—a verb that he did not hesitate to use time and ... His baccalaureate thesis, De Principio Individui (“On the Principle of the ... To ward off this danger and divert the King's interests elsewhere, the ...

Fukushima accident | Summary, Effects, & Facts | Britannica

Fukushima accident, disaster that occurred in 2011 at the Fukushima Daiichi ('Number ... Daiichi nuclear power plant, northeastern Fukushima prefecture, Japan, ... 3 to overheat and partially melt down, leading at times to the release of radiation. ... It was not until the middle of December 2011 that Japanese Prime Minister ...

Muhammad Ali | Biography, Bouts, Record, & Facts | Britannica

24 Jul 2020 ... Muhammad Ali, American boxer and social activist who was the first ... who were opposed to war in any form, Ali was not eligible for such an ...

Christopher Columbus | Biography, Voyages, & Facts | Britannica

Christopher Columbus, master navigator whose four transatlantic voyages ... way to one shaped from the perspective of the inhabitants of the Americas themselves. ... Felipa died in 1485, and Columbus took as his mistress Beatriz Enríquez de ... by which down to this day we do not know certainly that anyone has passed; ...

Gamal Abdel Nasser | Biography & Facts | Britannica

Gamal Abdel Nasser, Egyptian army officer who served as prime minister ... by the Muslim Brotherhood, Nasser cracked down on this extremist Muslim religious ... Even the loss of two wars, with disastrous results for Egypt, did not dim the ...

Hagia Sophia | History, Facts, & Significance | Britannica

5 Aug 2020 ... Hagia Sophia, place of worship built at Constantinople (now Istanbul, Turkey) in the 6th century ... The original wooden minaret did not survive.

Steve Jobs | Biography, Apple, & Facts | Britannica

Steve Jobs, cofounder of Apple Computer, Inc. (now Apple Inc.), and a ... together, which they did after Hewlett-Packard formally turned down Wozniak's design in 1976. ... He would later be renowned for his insistence that the Macintosh be not ...

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