The removal of the ovaries together with the Fallopian tubes is called salpingo-oophorectomy. Oophorectomy and salpingo-oophorectomy are not common forms of birth control in humans; more usual is tubal ligation, in which the Fallopian tubes are blocked but the ovaries remain intact.
In humans, oophorectomy is most usually performed together with a hysterectomy - the removal of the uterus. Its use in a hysterectomy when there are no other health problems is somewhat controversial.
In animals, spaying involves an invasive removal of the ovaries, but rarely has major complications; the superstition that it causes weight gain is not based on fact. Spaying is especially important for certain animals that require the ovum to be released at a certain interval (called estrus or "heat"), such as cats and dogs. If the cell is not released during these animal's heat, it can cause severe medical problems that can be averted by spaying or partnering the animal with a male.
The Russian Revolution of 1917 was a political movement in Russia that climaxed in 1917 with the overthrow of the provisional government that had replaced the Russian Tsar system, and led to the establishment of the Soviet Union, which lasted until its collapse in 1991. The Revolution can be viewed in two distinct phases. The first one was that of the February Revolution of 1917, which displaced the autocracy of Tsar Nicholas II of Russia, the last Tsar of Russia, and sought to establish in its place a liberal republic. The second phase was the October Revolution, in which the Soviets, inspired and increasingly controlled by Lenin's Bolshevik party, seized power from the Provisional Government. The revolution affected both the urban areas and the countryside. While many notable historical events occurred in Moscow and St. Petersburg, there was also a broadbased movement in the rural areas as peasants seized and redistributed land.
Main article: February Revolution.
The February Revolution came about almost spontaneously when people of Petrograd protested against the Tsarist regime because of food shortage in the city.
There was also great dissatisfaction with Russia's continued involvement in the First World War. As the protests grew, various political reformists (both liberal and radical left) started to coordinate some activity. In early February the protests turned violent as large numbers of city residents rioted and clashed with police and soldiers. When the bulk of the soldiers garrisoned in the Russian capital Petrograd joined the protests, they turned into a revolution ultimately leading to the abdication of Tsar Nicholas II in a nearly bloodless transition of power.
Between February and October numerous anarchist and communist (Bolshevik) revolutionists attempted to foment further revolution. In July, the St. Petersburg Military section of the Bolshevik Party, in combination with a major working class Bolshevik Party branch and the Petrograd anarchists, fomented a civil revolt. However, this revolt failed.
Main article: October Revolution.
The October Revolution was led by Lenin and was based upon the ideas of Karl Marx. It marked the beginning of the spread of communism in the twentieth century. It was far less sporadic than the revolution of February and came about as the result of deliberate planning and coordinated activity to that end. On November 7, 1917, Bolshevik leader Vladimir Lenin led his leftist revolutionaries in a nearly bloodless revolt against the ineffective Provisional Government (Russia was still using the Julian Calendar at the time, so period references show an October 25 date). The October Revolution ended the phase of the revolution instigated in February, replacing Russia's short-lived democratic government with a bolshevik one. Although many bolsheviks (such as Leon Trotsky) supported a soviet democracy , the 'reform from above' model gained definitive power when Lenin died and Stalin gained control of the USSR. Trotsky and his supporters, as well as a number of other democratically-minded communists, were persecuted and eventually imprisoned or killed.
Main article: Russian Civil War.
The Russian Civil War, which broke out in 1918 shortly after the revolution, brought death and suffering to millions of people regardless of their political orientation. The war was fought mainly between the "Reds", the communists and revolutionaries, and the "Whites" - the monarchists, conservatives, liberals and socialists who opposed the Bolshevik Revolution. The Whites had backing from nations such as the UK and USA.
Also during the Civil War, Nestor Makhno lead a Ukrainian anarchist movement which generally cooperated with the Bolsheviks. However, a Bolshevik force under Mikhail Frunze destroyed the Makhnovist movement, when the Makhnovists refused to merge into the Red Army. In addition, the so-called "Green Army" (nationalists and anarchists) played a secondary role in the war, mainly in Ukraine.
Resentment of royal absolutism. Resentment of the seigneurial system by peasants, wage-earners, and a rising bourgeoisie. The rise of enlightenment ideals. An unmanageable national debt, both caused by and exacerbating the burden of a grossly inequitable system of taxation. Food scarcity in the years immediately before the revolution. The rise of an ambitious bourgeoisie and, to a lesser extent, of the lower classes.
The Russian revolution was intended to spread across the world. Lenin and Trotsky said that the goal of socialism in Russia would not be realised without the success of the German Revolution. However, Stalin later rejected this idea, stating that socialism was possible in one country, even one as underdeveloped as Russia. Many leftists claim that Stalin's model of socialism (also known as Stalinism) was closer to state capitalism than actual Marxist socialism.
Dates are correct for the Julian calendar, which was used in Russia until 1918. It was twelve days behind the Gregorian calendar during the 19th century and thirteen days behind it during the 20th century.