Charles François du Fay Biography

Charles François du Fay

(Charles François de Cisternay du Fay; Paris, 1698-id., 1739) French physicist.He continued the investigations of Stephen Gray on the conduction of electricity and determined in 1733 the existence of two classes of electricity obtained by rubbing: resinous and vitreous, corresponding to what would later be called positive and negative electricity.He also distinguished between conductors and insulators and revealed the repulsion between electrically charged bodies of the same sign.He also conducted studies on crystalline optics.

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Hernando Tellez Biography

Hernando Téllez (Santafé de Bogotá, 1908-1966) Colombian writer and journalist.From a very young age, he showed his journalistic skills, as a contributor to the magazine Universidad directed by Germán Arciniegas, and as an assistant to Enrique Santos in El Tiempo . He was also deputy director of El Liberal and director of the magazine Semana .During the period between 1943 and 1944 he served as Colombian consul in Marseille and senator of the Republic, but he stood out above all for being one of the most complete writers of his time (he was a translator, commentator, short story writer, essayist and literary critic ). In his extensive essay work he dealt with issues of literature, society, politics and everyday life.Téllez was a poet of the essay, as well as profound; He was a great craftsman of the language, a teacher in a sober and effective handling of the language.He was a sensitive observer of daily life, an acute critic of the social and political life of the country...

José Bonifácio de Andrada e Silva Biography

José Bonifácio de Andrada e Silva (Santos, Brazil, 1763-Niteroi, id., 1838) Brazilian politician and scientist.He traveled through Europe dedicated to the study of mineralogy, and came into contact with the Enlightenment.In 1819, with an established prestige, he returned to Brazil and was involved in the decisive events that took place in the then colony.Member of the Freemasonry and close collaborator of the future Pedro I, he contributed to the preparation of the independence movement of 1822, which proclaimed Pedro I Emperor of Brazil.Later, and in view of the new political events that distanced him from the king, he emigrated to France (1823-1829).In 1831, and after the monarch's abdication of his five-year-old son, the future Pedro II, he returned to Brazil as the young king's tutor.

Cesar Uribe Piedrahita Biography

César Uribe Piedrahita (Medellín, 1897-Bogotá, 1951) Colombian doctor and writer.Wise in science and letters, in his time he embodied the ideal of Renaissance humanism, and left a brief but intense literary production characterized by his deep concern for the problems of his nation and, in general, for the demand for a series of social reforms, political, economic and cultural that contribute to improve the living conditions of the less favored classes. In his youth, inclined towards the study of scientific disciplines, he studied Medicine at the University of Antioquia, where he graduated in 1922 to complete his medical training in the North American classrooms of Harvard.He was soon considered an eminence in his facultative specialty (parasitology), before leaving Harvard University he had already carried out various teaching and research functions there, for which, on his return to his native country, he was appointed director of the National Institute of Hygiene. From this p...

Social classes in the Roman Empire: Patricios, Noble Commoners and Gentlemen Commoners

The Roman Empire has been one of the most powerful, extensive and important in the history of Humanity.Many peoples fell under the yoke of Rome, and today you can still admire the architectural remains of a civilization that reached a splendor almost absolute.However, in the Roman Empire there were great differences between the different strata that made up the society.Although from the oldest civilizations there were already different orders or "classes", today we focus on the different social classes in the Roman Empire: Patricios, Noble Commoners and Gentlemen Plebeians . Social classes in the Roman Empire The Roman civilization is one of the most complex societies of universal history.Given its long duration (since 8th century BC until the 5th century AD ) historians have divided the History of Rome into different historical periods: Monarchy, Republic of Empire .Today I propose you to enter the most splendid years of the Roman Empire ( sI and II BC .), ...

Joseph Reinach Biography

Joseph Reinach (Paris, 1856-1921) French journalist.He started in the journalistic profession through the Parisian newspaper La République Française , where from 1877 he began to publish interesting political analyzes that placed him at the epicenter of French public life in the last quarter of the century XIX.He acquired such importance in such a short space of time that in 1881, following the proclamation in France of the Third Republic, President León Gambetta called him to his side to place all his trust in him and appoint him head of his secretariat. At only thirty years old (1886), he became editor-in-chief of La République Française .Once this position was released, he directed a noisy journalistic campaign from the pages of the newspaper against the nationalist and populist politics of Georges Boulanger (the " General Revanche ").With this and other similar matters of maximum national interest, Joseph Reinach continued to rise in French public life and, in 188...

Ian Richard Kyle Paisley Biography

Ian Richard Kyle Paisley (Belfast, 1926) Ulster ecclesiastic and politician.Founder of the Free Presbyterian Church of Northern Ireland (1951), he opposed the rapprochement between Protestantism and the Vatican and was against the civil rights movement.Leader of the Democratic Unionist Party, he rallied Protestant extremists around him in his campaigns against the Catholics of Ulster.Member of the Assembly of Northern Ireland (1973-1974) and of the British Parliament since 1970.Founder of the paramilitary group Ulster Defense Association (1981), between 1990 and 1994 he boycotted the peace talks on several occasions with the British government.In 1999 he was elected MEP.

José María Plans and Freire Biography

José María Plans y Freire (José María Plans y Freyre or Freire; Barcelona, 1878-Madrid, 1934) Spanish scientist.After studying physical-mathematical sciences at the University of Barcelona, Plans y Freyre completed a doctorate in Madrid.In 1905 he obtained by opposition the chair of physics and chemistry at the Castellón de la Plana Institute of Secondary Education, and in 1909 the chair of rational mechanics at the University of Zaragoza. He stayed in this city until 1917, to hold the chair of cosmography and physics of the globe, and also gave a series of lectures on thermodynamics, gathered in a book entitled Lessons in thermodynamics (1913).In 1917, Plans y Freyre obtained the chair of celestial mechanics at the University of Madrid and in the academic year 1917-1918 he joined together with José Gabriel Álvarez Ude in the laboratory and mathematical seminar of the Board for Expansion of Studies, directed by Julio Rey Pastor, as a collaborator and research director. The...

Joseph Bramah Biography

Joseph Bramah (Stainborough, 1749-London, 1814) British inventor.A mechanic by profession, he carried out numerous practical inventions: a security lock, a hydraulic press, the water-closet or toilet system, a printer to number banknotes, etc.

Jose Hernandez Biography

José Hernández (Perdriel, San Martín, 1834-Buenos Aires, 1886) Argentine poet, author of Martín Fierro , a work that is considered the pinnacle of gaucho literature and an outstanding classic of Argentine literature. José Hernández As a child he was in the care of uncles and grandparents while his parents worked in the fields.He studied at the Liceo Argentino de San Telmo, but a chest illness made him leave Buenos Aires and join his father in a field of Camarones; by then the mother had died.The young Hernández stayed there for a few years, immersing himself in the rural world. He returned to Buenos Aires after the Battle of Caseros (1852), and was involved in the political struggles that divided the country after the fall of Juan Manuel de Rosas.Of federal convictions, he joined the government of the Confederation, faced with Buenos Aires.For 1856 some sources place it in Paraná; others delay that residence until 1858, but the truth is that Hernández worked in that city as a...

Georg Hermann Quincke Biography

Georg Hermann Quincke (Frankfurt am Oder, 1834-Heidelberg, 1924) German physicist.He studied at the University of Berlin, where he obtained his degree in 1865.He was an assistant professor at said University, in 1872 he was head of the University of Wurzburg and in 1875 of Heidelberg.He conducted research on the most well-known molecular phenomena, such as capillarity, flocculation, electrophoresis, and surface tension.He also investigated the phenomena of optical reflection on metal surfaces and optical interference.He built various measuring devices, such as an acoustic thermometer and a magnetic manometer.A certain device that allows the wavelength of sound waves to be measured through interference phenomena is called the Quincke tube.

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