Leonhard Euler (/ˈɔɪlər/OY-lər; German:[ˈleːɔnhaʁtˈʔɔʏlɐ]ⓘ, Swiss Standard German:[ˈleɔnhardˈɔʏlər]; 15 April 1707 – 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. He also introduced much of modern mathematical terminology and notation, including the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy, and music theory. As a result, Euler has been described as a "universal genius" who "was fully equipped with almost unlimited powers of imagination, intellectual gifts and extraordinary memory".
Euler is regarded as arguably the most prolific contributor in the history of mathematics and science, and the greatest mathematician of the 18th century. Several great mathematicians who produced their work after Euler's death have recognised his importance in the field as shown by quotes attributed to many of them: Pierre-Simon Laplace expressed Euler's influence on mathematics by stating, "Read Euler, read Euler, he is the master of us all." Carl Friedrich Gauss wrote: "The study of Euler's works will remain the best school for the different fields of mathematics, and nothing else can replace it." His 866 publications and his correspondence are being collected in the Opera Omnia Leonhard Euler which, when completed, will consist of 81 quartos. He spent most of his adult life in Saint Petersburg, Russia, and in Berlin, then the capital of Prussia. (Full article...)
Nadezhda Vasilievna Stasova (Russian: Надежда Васильевна Стасова; June 24 [O.S. June 12] 1822 – October 9 [O.S. September 27] 1895) was a Russian educator, activist, and feminist. Stasova was born into a noble and wealthy family; Tsar Alexander I of Russia was her godfather, and she received extensive private tutoring as a child. After experiencing family tragedy and personal disappointment as a young woman, she dedicated herself to women's education and economic empowerment. Alongside Anna Filosofova and Maria Trubnikova, Stasova was one of the earliest leaders of the Russian women's movement. Together, the three friends and allies were referred to as the "triumvirate".
The triumvirate founded and led several organizations designed to promote women's cultural and economic independence, including a publishing cooperative. Subsequently, the triumvirate pushed government officials to allow higher education for women, although continuing opposition meant that their successes were sometimes limited or reversed. Stasova eventually became the lead organizer of the Bestuzhev Courses in 1878, but a decade later was forced to resign under political pressure. In her final years, she continued her support for the cause of women's rights in Russia. Stasova died in 1895. (Full article...)
Although musically precocious, Tchaikovsky was educated for a career as a civil servant as there was little opportunity for a musical career in Russia at the time and no system of public music education. When an opportunity for such an education arose, he entered the nascent Saint Petersburg Conservatory, from which he graduated in 1865. The formal Western-oriented teaching that Tchaikovsky received there set him apart from composers of the contemporary nationalist movement embodied by the Russian composers of The Five with whom his professional relationship was mixed. (Full article...)
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Rostislav between 1907 and 1916.
Rostislav was a pre-dreadnought battleship built by the Nikolaev Admiralty Shipyard in the 1890s for the Black Sea Fleet of the Imperial Russian Navy. She was conceived as a small, inexpensive coastal defence ship, but the Navy abandoned the concept in favor of a compact, seagoing battleship with a displacement of 8,880 long tons (9,022 t). Poor design and construction practices increased her actual displacement by more than 1,600 long tons (1,626 t). Rostislav became the world's first capital ship to burn fuel oil, rather than coal. Her combat ability was compromised by the use of 10-inch (254 mm) main guns instead of the de facto Russian standard of 12 inches (305 mm).
Her hull was launched in September 1896, but non-delivery of the ship's main guns delayed her maiden voyage until 1899 and her completion until 1900. In May 1899 Rostislav became the first ship of the Imperial Navy to be commanded by a member of the House of Romanov, Captain Alexander Mikhailovich. From 1903 to 1912 the ship was the flagship of the second-in-command of the Black Sea Fleet. During the 1905 Russian Revolution her crew was on the verge of mutiny, but ultimately remained loyal to the regime, and actively suppressed the mutiny of the cruiser Ochakov. (Full article...)
Pyotr Ilyich Tchaikovsky's relations with the group of composers known as the Belyayev circle, which lasted from 1887 until Tchaikovsky's death in 1893, influenced all of their music and briefly helped shape the next generation of Russian composers. This group was named after timber merchant Mitrofan Belyayev, an amateur musician who became an influential music patron and publisher after he had taken an interest in Alexander Glazunov's work. By 1887, Tchaikovsky was firmly established as one of the leading composers in Russia. A favorite of Tsar Alexander III, he was widely regarded as a national treasure. He was in demand as a guest conductor in Russia and Western Europe, and in 1890 visited the United States in the same capacity. By contrast, the fortunes of the nationalistic group of composers known as The Five, which preceded the Belyayev circle, had waned, and the group had long since dispersed; of its members, only Nikolai Rimsky-Korsakov remained fully active as a composer. Now a professor of musical composition and orchestration at the Saint Petersburg Conservatory, Rimsky-Korsakov had become a firm believer in the Western-based compositional training that had been once frowned upon by the group.
As a result of the time Tchaikovsky spent with the Belyayev circle's leading composers—Glazunov, Anatoly Lyadov and Rimsky-Korsakov—the somewhat fraught relationship he had previously endured with The Five would eventually meld into something more harmonious. Tchaikovsky's friendship with these men gave him increased confidence in his own abilities as a composer, while his music encouraged Glazunov to broaden his artistic outlook past the nationalist agenda and to compose along more universal themes. This influence grew to the point that Glazunov's Third Symphony became known as the "anti-kuchist" symphony of his oeuvre ("kuchist" refers to "kuchka", the shortened Russian name for The Five) and shared several stylistic fingerprints with Tchaikovsky's later symphonies. Nor was Glazunov the only composer so influenced. Rimsky-Korsakov wrote about the Belyayev composers' "worship of Tchaikovsky and ... tendency toward eclecticism" that became prevalent during this period, along with a predilection toward "Italian-French music of the time of wig and farthingale" (that is, of the 18th Century) typified in Tchaikovsky's late operas The Queen of Spades and Iolanta. (Full article...)
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond as a form of carbon is tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of electricity, and insoluble in water. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, but diamond is metastable and converts to it at a negligible rate under those conditions. Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used in major industrial applications such as cutting and polishing tools. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth.
Because the arrangement of atoms in diamond is extremely rigid, few types of impurity can contaminate it (two exceptions are boron and nitrogen). Small numbers of defects or impurities (about one per million of lattice atoms) can color a diamond blue (boron), yellow (nitrogen), brown (defects), green (radiation exposure), purple, pink, orange, or red. Diamond also has a very high refractive index and a relatively high optical dispersion. (Full article...)
The polar bear (Ursus maritimus) is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed. The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300–800 kg (660–1,760 lb). The species is sexually dimorphic, as adult females are much smaller. The polar bear is white- or yellowish-furred with black skin and a thick layer of fat. It is more slender than the brown bear, with a narrower skull, longer neck and lower shoulder hump. Its teeth are sharper and more adapted to cutting meat. The paws are large and allow the bear to walk on ice and paddle in the water.
Polar bears are both terrestrial and pagophilic (ice-living) and are considered marine mammals because of their dependence on marine ecosystems. They prefer the annual sea ice but live on land when the ice melts in the summer. They are mostly carnivorous and specialized for preying on seals, particularly ringed seals. Such prey is typically taken by ambush; the bear may stalk its prey on the ice or in the water, but also will stay at a breathing hole or ice edge to wait for prey to swim by. The bear primarily feeds on the seal's energy-rich blubber. Other prey include walruses, beluga whales and some terrestrial animals. Polar bears are usually solitary but can be found in groups when on land. During the breeding season, male bears guard females and defend them from rivals. Mothers give birth to cubs in maternity dens during the winter. Young stay with their mother for up to two and a half years. (Full article...)
Rimsky-Korsakov believed in developing a nationalistic style of classical music, as did his fellow composer Mily Balakirev and the critic Vladimir Stasov. This style employed Russian folk song and lore along with exotic harmonic, melodic and rhythmic elements in a practice known as musical orientalism, and eschewed traditional Western compositional methods. Rimsky-Korsakov appreciated Western musical techniques after he became a professor of musical composition, harmony, and orchestration at the Saint Petersburg Conservatory in 1871. He undertook a rigorous three-year program of self-education and became a master of Western methods, incorporating them alongside the influences of Mikhail Glinka and fellow members of The Five. Rimsky-Korsakov's techniques of composition and orchestration were further enriched by his exposure to the works of Richard Wagner. (Full article...)
The Caspian expeditions of the Rus' were military raids undertaken by the Rus' between the late 9th century and c. 1041 on the Caspian Sea shores, of what are nowadays Iran, Dagestan, and Azerbaijan. Initially, the Rus' appeared in Serkland in the 9th century travelling as merchants along the Volga trade route, selling furs, honey, and slaves. The first small-scale Viking raids took place in the late 9th and early 10th century. The Rus' undertook the first large-scale expedition in 913; having arrived on 500 ships, they pillaged in the Gorgan region, in the territory of present-day Iran, and more to the west, in Gilan and Mazandaran, taking slaves and goods. On their return, the northern raiders were attacked and defeated by the Khazars in the Volga Delta, and those who escaped were killed by the local tribes in the middle Volga.
During their next expedition in 943, the Rus' captured Bardha'a, the capital of Arran, in the modern-day Republic of Azerbaijan. The Rus' stayed there for several months, killing many inhabitants of the city and amassing substantial plunder. It was only an outbreak of dysentery among the Rus' that forced them to depart with their spoils. Sviatoslav, prince of Kiev, commanded the next attack, which destroyed the Khazar state in 965. Sviatoslav's campaign established the Rus's hold on the north-south trade routes, helping to alter the demographics of the region. Raids continued through the time period with the last Scandinavian attempt to reestablish the route to the Caspian Sea taking place in c. 1041 by Ingvar the Far-Travelled. (Full article...)
At the 2008 NHL Entry Draft, Filatov was selected sixth overall by the Blue Jackets. Filatov was the top-ranked European skater by the NHL Central Scouting Bureau. Filatov played two seasons with the Blue Jackets organization. During the 2009–10 season, Filatov was unhappy with his situation in Columbus and was loaned to CSKA Moscow for the remainder of the season. At the 2011 NHL Entry Draft, the Blue Jackets then traded him to Ottawa in exchange for a third-round draft pick. In December 2011, the Senators loaned Filatov to CSKA Moscow for the balance of the 2011–12 season. The following season, Filatov signed with Salavat Yulaev. The Senators chose not to tender Filatov a qualifying offer, making him a free agent. (Full article...)
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Bezhin Meadow (Бежин луг, Bezhin lug) is a 1937 Soviet propaganda film, famous for having been suppressed and believed destroyed before its completion. Directed by Sergei Eisenstein, it tells the story of a young farm boy whose father attempts to betray the government for political reasons by sabotaging the year's harvest and the son's efforts to stop his own father to protect the Soviet state, culminating in the boy's murder and a social uprising. The film draws its title from a story by Ivan Turgenev, but is based on the (largely fabricated) life story of Pavlik Morozov, a young Russian boy who became a political martyr following his death in 1932, after he supposedly denounced his father to Soviet government authorities and subsequently died at the hands of his family. Pavlik Morozov was immortalized in school programs, poetry, music, and film.
Commissioned by a communist youth group, the film's production ran from 1935 to 1937, until it was halted by the central Soviet government, which said it contained artistic, social, and political failures. Some, however, blamed the failure of Bezhin Meadow on government interference and policies, extending all the way to Joseph Stalin himself. In the wake of the film's failure, Eisenstein publicly recanted his work as an error. Individuals were arrested during and after the ensuing debacle. (Full article...)
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Launch of Izmail in 1915
The Borodino-class battlecruisers (Russian: Линейные крейсера типа «Измаил») were a group of four battlecruisers ordered by the Imperial Russian Navy before World War I. Also referred to as the Izmail class, they were laid down in late 1912 at Saint Petersburg for service with the Baltic Fleet. Construction of the ships was delayed by a lack of capacity among domestic factories and the need to order some components from abroad. The start of World War I slowed their construction still further, as the imported components were often not delivered and domestic production was diverted into areas more immediately useful for the war effort.
Three of the four ships were launched in 1915 and the fourth in 1916. Work on the gun turrets lagged, and it became evident that Russian industry would not be able to complete the ships during the war. The Russian Revolution of 1917 halted all work on the ships, which was never resumed. Although some consideration was given to finishing the hulls that were nearest to completion, the three furthest from completion were sold for scrap by the Soviet Union during the early 1920s. The Soviet Navy proposed to convert Izmail, the ship closest to completion, to an aircraft carrier in 1925, but the plan was cancelled after political manoeuvring by the Red Army cut funding and she was eventually scrapped in 1931. (Full article...)
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Marshal Mortier at the battle of Durenstein in 1805, Auguste Sandoz
The Battle of Dürenstein (German: Schlacht bei Dürnstein; also known as Dürrenstein, Dürnstein and Diernstein) or the Battle of Krems (Russian: Сражение при Кремсе), on 11 November 1805, was an engagement in the Napoleonic Wars during the War of the Third Coalition. Dürenstein (modern Dürnstein), Austria, is located in the Wachau valley, on the river Danube, 73 kilometers (45 mi) upstream from Vienna, Austria. The river makes a crescent-shaped curve between Dürnstein and nearby Krems an der Donau, and the battle was fought in the flood plain between the river and the mountains.
At Dürenstein, a combined force of Russian and Austrian troops trapped a French division commanded by Théodore Maxime Gazan. The French division was part of the newly created VIII Corps, the so-called Corps Mortier, under command of Édouard Mortier. In pursuing the Austrian retreat from Bavaria, Mortier had over-extended his three divisions along the north bank of the Danube. Mikhail Kutuzov, commander of the Coalition force, enticed Mortier to send Gazan's division into a trap and French troops were caught in a valley between two Russian columns. They were rescued by the timely arrival of a second division, under command of Pierre Dupont de l'Étang. The battle extended well into the night, after which both sides claimed victory. The French lost more than a third of their participants, and Gazan's division experienced over 40 percent losses. The Austrians and Russians also had heavy losses—close to 16 percent—but perhaps the most significant was the death in action of Johann Heinrich von Schmitt, one of Austria's most capable chiefs of staff. (Full article...)
The 1907 Tiflis bank robbery, also known as the Erivansky Square expropriation, was an armed robbery on 26 June 1907[a] in the city of Tiflis (present-day Tbilisi, the capital of Georgia) in the Tiflis Governorate in the Caucasus Viceroyalty of the Russian Empire. A Bolshevik group "expropriated" a bank cash shipment to fund their revolutionary activities. The robbers attacked a bank stagecoach, and the surrounding police and soldiers, using bombs and guns while the stagecoach was transporting money through Erivansky Square (present-day Freedom Square) between the post office and the Tiflis branch of the State Bank of the Russian Empire. The attack killed forty people and injured fifty others, according to official archive documents. The robbers escaped with 241,000 rubles.
The robbery was organized by a number of top-level Bolsheviks, including Vladimir Lenin, Joseph Stalin, Maxim Litvinov, Leonid Krasin, and Alexander Bogdanov; and executed by a party of revolutionaries led by Stalin's early associate Simon Ter-Petrosian, also known as "Kamo" and "The Caucasian Robin-Hood". Because such activities had been explicitly prohibited by the 5th Congress of the Russian Social Democratic Labour Party (RSDLP) only weeks previously, the robbery and the killings caused outrage within the party against the Bolsheviks (a faction within the RSDLP). As a result, Lenin and Stalin tried to distance themselves from the robbery. (Full article...)
Although James Clerk Maxwell made the first color photograph in 1861, the results were far from realistic until Prokudin-Gorsky perfected the technique with a series of improvements around 1905. His process used a camera that took a series of monochrome pictures in rapid sequence, each through a different colored filter. Prokudin-Gorskii then went on to document much of the country of Russia, travelling by train in a specially equipped darkroomrailroad car.
Alexis (1629–1676) was the tsar of Russia from 1645 until his death. Born in Moscow on 29 March 1629, the son of Tsar Michael and Eudoxia Streshneva, the sixteen-year-old Alexis acceded to the throne after his father's death. Boris Morozov, a shrewd boyar open to Western ideas, took charge of Russia in the early years of Alexis's reign, but was exiled from Moscow following a popular uprising. Alexis responded to the uprising with a new legal code. His reign saw wars with Poland and with Sweden, a schism in the Russian Orthodox Church, and the major Cossack revolt of Stenka Razin. Alexis was married twice and had sixteen children, including tsars Fyodor III; Ivan V; Peter the Great; and Sofia, who ruled as regent for her brothers from 1682 to 1689.
This oil painting, made by an unknown artist in the 1670s, is now located in a museum in Ptuj, Slovenia.
An Alaskan parchment scrip banknote in the denomination of 1 ruble, printed on vellum or parchment by the Russian-American Company. On the obverse, the horizontal text immediately beneath the double-headed eagle reads "Seal of the Russian American Company". The oval text reads "under august protection of His Imperial Majesty", and under the oval is the value of the note "one ruble".
Alaskan parchment scrip was used as a form of company scrip in Alaska when it was a possession of the Russian Empire. In circulation from 1816 to 1867, such scrip could be printed on vellum, parchment, or pinniped skin. Denominations of 10, 25, 50 kopecks and 1, 5, 10, and 25 rubles were issued.
A painting depicting Ivan Tsarevich, one of the main heroes of Russian folklore, riding a magic carpet after having captured the Firebird, which he keeps in a cage. This work was Viktor Vasnetsov's first attempt at illustrating Russian folk tales and inaugurated a famous series of paintings on the themes drawn from Russian folklore.
The current main building of the Moscow State University in Sparrow Hills, Moscow, Russia. Designed by Lev Rudnev and completed by 1953, the 240-metre (790 ft) tall structure was the tallest building in Europe until the completion of the Messeturm in 1990.
Sadko is a character in the Russian medieval epic Bylina. An adventurer, merchant and gusli musician from Novgorod, Sadko becomes wealthy with the help of the Sea Tsar, but is thrown in the sea when he fails to pay the Sea Tsar his due respects. This story was widely adapted in the 19th century, including in a poem by Alexei Tolstoy and an opera by Nikolai Rimsky-Korsakov.
Shown here is Sadko in the Underwater Kingdom, an 1876 painting by Ilya Repin. It depicts Sadko meeting the Sea Tsar under the sea.
Leo Tolstoy (1828–1910) was a Russian writer who is regarded as one of the world's greatest novelists. He is best known for War and Peace (1869) and Anna Karenina (1877), often cited as pinnacles of realist fiction. Born to an aristocratic family on 9 September [O.S. 28 August] 1828, Tolstoy was orphaned when he was young. He studied at Kazan University, but this was not a success, and he left university without completing his degree. During this time, he began to write and published his first novel, Childhood, in 1852. Tolstoy later served at the Siege of Sevastopol during the Crimean War, and was appalled by the number of deaths and left at the conclusion of the war. He spent the remainder of his life writing whilst also marrying and starting a family. In the 1870s he converted to a form of fervent Christian anarchism.
An aerial view of the Field of Mars, a large park in central Saint Petersburg, Russia, pictured in 2016. It is named after Mars, the Roman god of war. The park's history goes back to the 18th century, when it was converted from bogland and named the Grand Meadow. Later, it was the setting for celebrations to mark Russia's victory over Sweden in the Great Northern War. Its next name, the Tsaritsyn Meadow, appears after the royal family commissioned Francesco Bartolomeo Rastrelli to build the Summer Palace for Empress Elizabeth. It became the Field of Mars during the reign of Paul I. Towards the end of the 18th century, the park became a military drill ground, where they erected monuments commemorating the victories of the Russian Army and where parades and military exercises took place regularly. After the February Revolution in 1917, the Field of Mars became a memorial area for the revolution's honoured dead. In the summer of 1942, as the city was besieged by the German army in the Siege of Leningrad, the park was covered with vegetable gardens to supply food. An eternal flame was lit in the centre of the park in 1957, in memory of the victims of various wars and revolutions.
A female Siberian tiger (Panthera tigris altaica), a subspecies of tiger native to Central Asia, and her cub. The Siberian tiger is the largest of the extant tiger subspecies as well as the largest felid, attaining 320 kg (710 lb) in an exceptional specimen. Considered an endangered subspecies, the wild population is down to several hundred individuals and is limited to eastern Siberia.
This photo of the Nilov Monastery on Stolobny Island in Tver Oblast, Russia, was taken by Sergey Prokudin-Gorsky in 1910 before the advent of colour photography. His process used a camera that took a series of monochrome pictures in rapid sequence, each through a different coloured filter. By projecting all three monochrome pictures using correctly coloured light, it was possible to reconstruct the original colour scene.
The Portrait of Chaliapin is an oil-on-canvas painting by Boris Kustodiev, produced in 1921. Feodor Chaliapin was a Russian opera singer; possessing a deep and expressive bass voice, he enjoyed an important international career at major opera houses. He is depicted here wearing an expensive fur coat, which had come from a Soviet warehouse containing items confiscated from rich people during the Russian Revolution, and which he had received in lieu of payment for a performance. The background shows festivities at the traditional folk holiday of Maslenitsa. Dressed in a smart suit and holding a cane, Chaliapin is portrayed as having risen above his contemporaries. His favourite dog is at his feet and, at the bottom left, his two daughters stroll on the festive square in front of a poster promoting his concert. This copy of the painting is in the collection of the Russian Museum in Saint Petersburg.
Chicken Kiev, also known as chicken Kyiv and chicken à la Kyiv, is a dish made of chickenfillet pounded and rolled around cold butter, then coated with egg and bread crumbs, and either fried or baked. Since fillets are often referred to as suprêmes in professional cookery, the dish is also called "suprême de volaille à la Kiev". Stuffed chicken breast is generally known in Russian and Ukrainian cuisines as côtelette de volaille. Though it has disputed origins, the dish is particularly popular in the post-Soviet states, as well as in several other countries of the former Eastern Bloc, and in the English-speaking world. (Full article...)
At the 2008 NHL Entry Draft, Filatov was selected sixth overall by the Blue Jackets. Filatov was the top-ranked European skater by the NHL Central Scouting Bureau. Filatov played two seasons with the Blue Jackets organization. During the 2009–10 season, Filatov was unhappy with his situation in Columbus and was loaned to CSKA Moscow for the remainder of the season. At the 2011 NHL Entry Draft, the Blue Jackets then traded him to Ottawa in exchange for a third-round draft pick. In December 2011, the Senators loaned Filatov to CSKA Moscow for the balance of the 2011–12 season. The following season, Filatov signed with Salavat Yulaev. The Senators chose not to tender Filatov a qualifying offer, making him a free agent. (Full article...)
... that near the end of her life, feminist and educator Nadezhda Stasova wrote that Russian women "still have not learned to stop being men's slaves"?
... that American teacher Marc Fogel was sentenced to 14 years in Russian prison for possessing a small amount of marijuana, but has gotten little public attention compared to Brittney Griner?
... that around the age of four, Jacob von Eggers was deported to Arkhangelsk in Russia together with the entire German-speaking population of Tartu?
In Russia we only had two TV channels. Channel One was propaganda. Channel Two consisted of a KGB officer telling you: Turn back at once to Channel One.
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![Image 1 Portrait by Jakob Emanuel Handmann, 1753 Leonhard Euler (/ˈɔɪlər/ OY-lər; German: [ˈleːɔnhaʁt ˈʔɔʏlɐ] ⓘ, Swiss Standard German: [ˈleɔnhard ˈɔʏlər]; 15 April 1707 – 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. He also introduced much of modern mathematical terminology and notation, including the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy, and music theory. As a result, Euler has been described as a "universal genius" who "was fully equipped with almost unlimited powers of imagination, intellectual gifts and extraordinary memory". Euler is regarded as arguably the most prolific contributor in the history of mathematics and science, and the greatest mathematician of the 18th century. Several great mathematicians who produced their work after Euler's death have recognised his importance in the field as shown by quotes attributed to many of them: Pierre-Simon Laplace expressed Euler's influence on mathematics by stating, "Read Euler, read Euler, he is the master of us all." Carl Friedrich Gauss wrote: "The study of Euler's works will remain the best school for the different fields of mathematics, and nothing else can replace it." His 866 publications and his correspondence are being collected in the Opera Omnia Leonhard Euler which, when completed, will consist of 81 quartos. He spent most of his adult life in Saint Petersburg, Russia, and in Berlin, then the capital of Prussia. (Full article...)](/wiki/File:Blank.png)
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![Image 9 Leo Tolstoy Photograph: F. W. Taylor; restoration: Yann Leo Tolstoy (1828–1910) was a Russian writer who is regarded as one of the world's greatest novelists. He is best known for War and Peace (1869) and Anna Karenina (1877), often cited as pinnacles of realist fiction. Born to an aristocratic family on 9 September [O.S. 28 August] 1828, Tolstoy was orphaned when he was young. He studied at Kazan University, but this was not a success, and he left university without completing his degree. During this time, he began to write and published his first novel, Childhood, in 1852. Tolstoy later served at the Siege of Sevastopol during the Crimean War, and was appalled by the number of deaths and left at the conclusion of the war. He spent the remainder of his life writing whilst also marrying and starting a family. In the 1870s he converted to a form of fervent Christian anarchism. More selected pictures](/wiki/File:Leo_Tolstoy_1897,_black_and_white,_37767u.jpg)
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