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Spontaneous splitting of embryos in the uterus after transfer can occur, but this is rare and would lead to identical twins. A double blind, randomised study followed IVF pregnancies that resulted in 73 infants, and reported that 8.7% of singleton infants and 54.2% of twins had a birth weight of less than 2,500 grams (5.5 lb). [ 78 ]
First observation of the very rare decay of the B s meson into two muons (B s 0 → μ + μ −), a major test of supersymmetry theories, [126] shows results at 3.5 sigma that match the Standard Model rather than many of its super-symmetrical variants. 20 Jan 2013 Start of the first run colliding protons with lead ions. 11 Feb 2013
The Bf 109A was the first version of the Bf 109. Armament was initially planned to be just two cowl-mounted 7.92 mm (.312 in) MG 17 machine guns.However, possibly due to the introduction of the Hurricane and Spitfire, each with eight 7.7 mm (.303 in) machine guns, experiments were carried out with a third machine gun firing through the propeller shaft. [2]
Ain'ts: [1] Nickname given to the New Orleans Saints after their 1980 season of 14 consecutive losses. The name persisted somewhat as, although they would later qualify for the playoffs several times since then, they did not win a playoff game until their defeat of the defending Super Bowl champion Rams in the wild-card round of the 2000–01 playoffs.
Class A was the 0-4-0 type, an arrangement best suited to small switcher locomotives (known as "shifters" in PRR parlance). Most railroads abandoned the 0-4-0 after the 1920s, but the PRR kept it for use on small industrial branches, especially those with street trackage and tight turns.
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The Mikoyan MiG-29 (Russian: Микоян МиГ-29; NATO reporting name: Fulcrum) is a twin-engine fighter aircraft designed in the Soviet Union.Developed by the Mikoyan design bureau as an air superiority fighter during the 1970s, the MiG-29, along with the larger Sukhoi Su-27, was developed to counter U.S. fighters such as the McDonnell Douglas F-15 Eagle and the General Dynamics F-16 ...
The Porsche 964 is a model of the Porsche 911 sports car manufactured and sold between 1989 and 1994. Designed by Benjamin Dimson through January 1986, it featured significant styling revisions over previous 911 models, most prominently the more integrated bumpers.