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"200" is the sixth episode of the science fiction television series Stargate SG-1's tenth season, and the 200th episode of the series overall. Unlike the more serious nature of the season's story arc, "200" is a light-hearted parody of both Stargate SG-1 and other sci-fi shows, as well as popular culture like The Wizard of Oz. "200" won the 2007 Constellation Award for Best Overall 2006 Science Fiction Film or Television Script, and was nominated for the 2007 Hugo Award for Best Dramatic Presentation, Short Form. The episode also marks the first time original SG-1 member Jack O'Neill (Richard Dean Anderson) is seen since the beginning of Season 9. The episode received a 1.9 average household rating, one of the few episodes of the season that surpassed the average rating of Stargate SG-1's previous season. "200" also received near-universal praise for its humor and writing. Despite the strong performance of the episode, the Sci-Fi Channel announced soon after the episode's airing it would not be renewing the series for another season.

The 21st Massachusetts Infantry Regiment was an infantry regiment in the Union Army during the American Civil War. It was organized in Worcester, Massachusetts and mustered into service on August 23, 1861. After garrison duty at the United States Naval Academy in Annapolis, Maryland, the regiment served with the Coast Division commanded by Maj. Gen. Ambrose Burnside. The Coast Division was deployed in January 1862 for operations on the coast of North Carolina, and participated in the Battle of Roanoke Island and the Battle of New Bern among other engagements. Burnside's division was recalled to Virginia in July 1862. The 21st Massachusetts Infantry was then attached to the Army of the Potomac and participated in several of the largest battles of the Civil War, including the Second Battle of Bull Run, the Battle of Antietam, and the Battle of Fredericksburg. The most devastating engagement of the war for the 21st was the Battle of Chantilly, fought on September 1, 1862, during which the unit suffered 35 percent casualties. From March 1863 to January 1864, the 21st served with Burnside in the Department of the Ohio, seeing action in Kentucky and eastern Tennessee. In May 1864, the regiment rejoined the Army of the Potomac, participating in Lt. Gen. Ulysses Grant's Overland campaign and the siege of Petersburg. The regiment was a favorite of Clara Barton, the famed battlefield nurse, who was also from Worcester County, Massachusetts. By the end of its three years of service, the 21st Massachusetts Infantry had been reduced from 1,000 men to fewer than 100. Of these losses, 152 were killed in action or died from wounds received in action, approximately 400 were discharged due to wounds, 69 were taken prisoner, and approximately 300 were discharged due to disease, resignation, or desertion. Those of the 21st who chose to re-enlist at the end of their initial three-year commitment were eventually consolidated with the 36th Massachusetts Infantry Regiment on October 21, 1864.

The 21st Waffen Mountain Division of the SS Skanderbeg (1st Albanian) was a German mountain infantry division of the Waffen-SS, the armed wing of the German Nazi Party that served alongside, but was never formally part of, the Wehrmacht during World War II. At the post-war Nuremberg trials, the Waffen-SS was declared to be a criminal organisation due to its major involvement in war crimes and crimes against humanity. The division was developed around the nucleus of an ethnic Albanian battalion which had briefly seen combat against the Yugoslav Partisans in eastern Bosnia as part of the 13th Waffen Mountain Division of the SS Handschar (1st Croatian). The rank-and-file were mostly Muslim Albanians with a few hundred Catholic Albanians and mostly German and Yugoslav Volksdeutsche (ethnic German) officers and non-commissioned officers, it was given the title Skanderbeg after medieval Albanian lord George Kastrioti Skanderbeg, who defended the region of Albania against the Ottoman Empire for more than two decades in the 15th century. Skanderbeg never reached divisional strength, being at most a brigade-sized formation of between 6,000 and 6,500 troops. In May 1944, members of the division arrested 281 Jews in Pristina and handed them over to the Germans, who transported them to the Bergen-Belsen concentration camp, where many were killed. The division itself was better known for this action and for murdering, raping, and looting in predominantly Serb areas than for participating in combat operations on behalf of the German war effort. Its only significant military actions took place during a German anti-Partisan offensive in the German occupied territory of Montenegro in June and July 1944. Following those operations, the unit was deployed as a guard force at the chromium mines in Kosovo, where it was quickly overrun by the Partisans, leading to widespread desertion. Reinforced by German Kriegsmarine personnel and with fewer than 500 Albanians remaining in its ranks, it was disbanded on 1 November 1944. The remaining members were incorporated into the 7th SS Volunteer Mountain Division Prinz Eugen. After the war, divisional commander SS-Brigadeführer und Generalmajor der Waffen-SS August Schmidhuber was found guilty of war crimes by a court in Belgrade and executed in 1947.

The 22nd Regiment Massachusetts Volunteer Infantry was an infantry regiment in the Union army during the American Civil War. The 22nd Massachusetts was organized by Senator Henry Wilson (future Vice-president during the Ulysses Grant administration) and was therefore known as "Henry Wilson's Regiment." It was formed in Boston, Massachusetts, and established on September 28, 1861, for a term of three years. Arriving in Washington in October 1861, the regiment spent the following winter in camp at Hall's Hill, near Arlington in Virginia. It became part of the Army of the Potomac, with which it would be associated for its entire term of service. The regiment saw its first action during the siege of Yorktown in April 1862. It was involved in the Peninsular campaign, particularly the Battle of Gaines' Mill during which it suffered its worst casualties (numerically) of the war. Their worst casualties in terms of percentages took place during the Battle of Gettysburg (60 percent). The 22nd Massachusetts was present for virtually all of the major battles in which the Army of the Potomac fought, including the Second Battle of Bull Run, the Battle of Antietam, the Battle of Fredericksburg, the Battle of Chancellorsville, the Battle of Gettysburg and Lieutenant General Ulysses Grant's Overland campaign. The 22nd was especially proficient in skirmish drill and was frequently deployed in that capacity throughout the war. During the siege of Petersburg in October 1864, the 22nd Massachusetts was removed from the lines and sent home to Massachusetts. Of the 1,100 who initially belonged to the unit, only 125 returned at the end of their three years of service. Of these losses, roughly 300 were killed in action or died from wounds received in action, approximately 500 were discharged due to wounds or disease, and approximately 175 were lost or discharged due to capture, resignation, or desertion.

23 Wall Street (also known as the J.P. Morgan Building) is a four-story office building in the Financial District of Manhattan in New York City, at the southeast corner of Wall Street and Broad Street. Designed by Trowbridge & Livingston in the neoclassical style and constructed from 1913 to 1914, it was originally the headquarters of J.P. Morgan & Co. Since the late 2000s, the building has remained unoccupied for long periods, although it has occasionally been used for events. The building has a facade of ashlar masonry and pink Tennessee marble. The first floor consists of a piano nobile over a low basement; above are the second story, the main cornice, and two more stories. After its completion, the building became known as the headquarters of J.P. Morgan & Co.—the "House of Morgan"—although its exterior was never signed with the Morgan name. The banking room, which took up nearly the entire ground floor, included offices and was used for banking transactions. This space was designed with a domed, coffered ceiling and, later, a large crystal chandelier. Mechanical systems and vaults were in the basement, and executive offices were placed on the upper floors. 23 Wall Street replaced the Drexel Building, which was the banking headquarters for J.P. Morgan & Co.'s predecessor Drexel, Morgan & Co. When the building was damaged during the Wall Street bombing in 1920, J.P. Morgan & Co. refused to make repairs, in defiance of the bombing's perpetrators. The building was linked to neighboring 15 Broad Street in 1957, and the two buildings served as the J.P. Morgan & Co. headquarters until 1988, when the firm moved to 60 Wall Street. During the 2000s, there were plans to convert both 23 Wall Street and 15 Broad Street into a condominium complex. In 2008, 23 Wall Street was sold to interests associated with the billionaire industrialist Sam Pa but mostly remained empty afterward. Depicted in several media works, 23 Wall Street's simple design was generally praised upon its completion. The building is a New York City designated landmark and is listed on the National Register of Historic Places (NRHP); it is also a contributing property to the NRHP-listed Wall Street Historic District.

The 23rd (Northumbrian) Division was an infantry division of the British Army, which fought briefly in the Battle of France during the Second World War. In March 1939, after the re-emergence of Germany as a European power and its occupation of Czechoslovakia, the British Army increased the number of divisions within the Territorial Army by duplicating existing units. The 23rd (Northumbrian) Division was formed in October 1939, as a second-line duplicate of the 50th (Northumbrian) Motor Division. It was made up of two brigades, unlike regular infantry divisions that were composed of three, with battalions hailing from the north of England. It was intended that the division would remain in the United Kingdom to complete training and preparation, before being deployed to France within twelve months of the war breaking out. The division spent little time training and its soldiers were dispersed and used to guard strategically important and vulnerable locations across North East England. Guard duty and little preparation for war were seen as a hindrance to good morale. In France, the British Expeditionary Force (BEF) was suffering from a manpower shortage among rear-line units. To boost morale, provide additional labour and guards for the rear echelon of the BEF, and score political points with the French Government and military, the division was sent to France in April 1940, leaving behind most of its administration and logistical units as well as heavy weapons and artillery. The men were assigned to aid in the construction and guarding of airfields. The Chief of the Imperial General Staff, Edmund Ironside, secured a promise from the BEF that the division would not be used in action owing to it being untrained and incomplete. When Germany invaded Belgium and the Netherlands, the BEF and French armies moved to meet the attack, leaving behind the 23rd Division to continue guarding airfields. The main German attack came through the Ardennes and moved to cut off the British and French forces in northern France. With no other reserves available, the 23rd Division was ordered to the front line to defend the Canal du Nord—the only watercourse obstacle between the main German assault and the English Channel—and the only defensible position at which to stop the German attempt to encircle the BEF. By the time the division arrived at the canal, the Germans had already crossed south of their sector where French forces had yet to take up positions. Having destroyed the bridges in their area, the division was ordered to fall back to new positions to defend the town of Arras. Before the 70th Infantry Brigade could take up this new position, it was caught by advancing German armoured forces and overrun. The military situation further deteriorated, resulting in the decision to begin the Dunkirk evacuation. Elements of the division conducted delaying and rearguard actions around the perimeter before being evacuated on 31 May 1940, having suffered heavy losses. In Britain, the division was disbanded and its units were transferred to other formations to bring them up to strength.

The 23rd Waffen Mountain Division of the SS Kama (2nd Croatian) was a German mountain infantry division of the Waffen-SS, the armed wing of the German Nazi Party that served alongside but was never formally part of the Wehrmacht during World War II. At the post-war Nuremberg trials, the Waffen-SS was declared to be a criminal organisation due to its major involvement in war crimes and crimes against humanity. The division was composed of German officers and Bosnian Muslim soldiers. Named Kama after a small dagger used by Balkan shepherds, it was one of the thirty-eight divisions fielded by the Waffen-SS during World War II. Formed on 19 June 1944, it was built around a cadre from the 13th Waffen Mountain Division of the SS Handschar (1st Croatian) but did not reach its full strength and never saw action as a formation. Elements of the division fought briefly against Soviet forces in southern Hungary in early October 1944 alongside the 31st SS Volunteer Grenadier Division. They were soon disengaged from the front line in Hungary and had begun a move to the German puppet state, the Independent State of Croatia, to join the 13th SS Division when the Bosnian Muslim soldiers of the Kama division mutinied on 17 October 1944. The cadre quickly regained control, but the mutiny resulted in the division being formally dissolved on 31 October 1944.

243 Ida is an asteroid in the Koronis family of the asteroid belt. It was discovered on 29 September 1884 by Austrian astronomer Johann Palisa at Vienna Observatory and named after a nymph from Greek mythology. Later telescopic observations categorized Ida as an S-type asteroid, the most numerous type in the inner asteroid belt. On 28 August 1993, Ida was visited by the uncrewed Galileo spacecraft while en route to Jupiter. It was the second asteroid visited by a spacecraft and the first found to have a natural satellite. Ida's orbit lies between the planets Mars and Jupiter, like all main-belt asteroids. Its orbital period is 4.84 years, and its rotation period is 4.63 hours. Ida has an average diameter of 31.4 km (19.5 mi). It is irregularly shaped and elongated, apparently composed of two large objects connected together. Its surface is one of the most heavily cratered in the Solar System, featuring a wide variety of crater sizes and ages. Ida's moon Dactyl was discovered by mission member Ann Harch in images returned from Galileo. It was named after the Dactyls, creatures which inhabited Mount Ida in Greek mythology. Dactyl is only 1.4 kilometres (0.87 mi) in diameter, about 1/20 the size of Ida. Its orbit around Ida could not be determined with much accuracy, but the constraints of possible orbits allowed a rough determination of Ida's density and revealed that it is depleted of metallic minerals. Dactyl and Ida share many characteristics, suggesting a common origin. The images returned from Galileo and the subsequent measurement of Ida's mass provided new insights into the geology of S-type asteroids. Before the Galileo flyby, many different theories had been proposed to explain their mineral composition. Determining their composition permits a correlation between meteorites falling to the Earth and their origin in the asteroid belt. Data returned from the flyby pointed to S-type asteroids as the source for the ordinary chondrite meteorites, the most common type found on the Earth's surface.

The 24th Waffen Mountain Division of the SS Karstjäger was a German mountain infantry division of the Waffen-SS, the armed wing of the German Nazi Party that served alongside but was never formally part of the Wehrmacht during World War II. At the post-war Nuremberg trials, the Waffen-SS was declared to be a criminal organisation due to its major involvement in war crimes and crimes against humanity. Named Karstjäger ("Karst Hunter"), the formation was one of the 38 divisions fielded by the Waffen-SS. Formed on 18 July 1944 from the SS Volunteer Karstwehr Battalion, its nominal strength was never more than theoretical and the division was soon reduced to the Waffen Mountain (Karstjäger) Brigade of the SS. Throughout its existence as a battalion, division and brigade, it was primarily involved in fighting partisans in the Karst Plateau on the frontiers of Yugoslavia, Italy, and Austria; the mountainous terrain required specialised mountain troops and equipment. Founded in 1942 as a company, the unit consisted mainly of Volksdeutsche (ethnic Germans/Austrians) from Yugoslavia and the South Tyrol province of Italy. Although focused on anti-partisan operations, it also saw action in the wake of the Italian surrender when it moved to disarm Italian troops in Tarvisio and protect ethnic German communities in Italy. In addition, at the end of the war it successfully fought to keep passes into Austria open, allowing German units to escape the Balkans and surrender to British forces. The remnants of the unit became some of the last Germans to lay down their arms when they surrendered to the British 6th Armoured Division on 9 May 1945. A joint Italian–German study implicated the division in 23 war crimes involving the killing of a total of 277 people between the Italian surrender and the end of the war.

270 Park Avenue, also known as the JPMorgan Chase Tower and the Union Carbide Building, was a skyscraper in the Midtown Manhattan neighborhood of New York City. Built in 1960 for chemical company Union Carbide, it was designed by the architects Gordon Bunshaft and Natalie de Blois of Skidmore, Owings & Merrill (SOM). The 52-story, 707 ft (215 m) skyscraper later became the global headquarters for JPMorgan Chase. It was demolished in 2021 to make way for a taller skyscraper at the same address. At the time of its destruction, the Union Carbide Building was the tallest voluntarily demolished building in the world. The building occupied a full city block bounded by Madison Avenue, 48th Street, Park Avenue, and 47th Street. It was composed of two sections: a 52-story tower facing Park Avenue to the east and a 12-story annex facing Madison Avenue to the west, both surrounded by public plazas. About two-thirds of 270 Park Avenue was built atop two levels of underground railroad tracks, which feed directly into Grand Central Terminal to the south. This not only prevented a basement from being built under most of the site but also required that the lobby be one story above ground level. Union Carbide's offices were designed around a grid of 5 by 5 ft (1.5 by 1.5 m) modules. The offices contained flexible furnishings and partitions, as well as luminous ceilings. The Union Carbide Building received mixed reviews during its existence, and the presence of the building's plazas helped influence the 1961 Zoning Resolution. The site was occupied by the Hotel Marguery between 1917 and 1957. Union Carbide leased the land from New York Central Railroad (later Penn Central) and announced plans for the building in 1955. Union Carbide moved into its headquarters in 1960 and acquired the underlying land in 1976 after Penn Central went bankrupt. After three years of negotiations, Union Carbide agreed in 1978 to sell the building to Manufacturers Hanover Corporation. Manufacturers Hanover moved into 270 Park Avenue in 1980 and renovated the building. Through several mergers, Manufacturers Hanover became part of JPMorgan Chase, which announced plans to demolish the building in 2018. Despite preservationists' objections, the Union Carbide Building was demolished from 2019 to 2021.