June 27, 2012
The human microbiome is the collection of microorganisms (such as bacteria and fungi) which live on and inside humans (on the skin, in the saliva and mouth, in the eyes, and in the gut and the rest of the gastrointestinal tract). Foreign microbes outnumber human cells in the body a wide margin; humans have about 100 trillion cells, and carry ten times as many microorganisms in the intestines alone.
Some of these organisms are useful for humans. However, most have no known effect; they are just symbionts and are referred to as the normal ‘flora.’ Studies in 2009 asked whether our health is damaged if we reduce this biota (collection of organisms in an ecosystem), which is certainly the case with gut flora (which can be restored by a ‘fecal transplant.’
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June 27, 2012
The M1911 is a .45 caliber pistol originally made by Colt, and is now the most copied pistol design in the world. It was made in the early 1900s and was used in World War I, World War II, The Korean War, and in the Vietnam War. It is semi-automatic and can fire a bullet each time the trigger is pulled. It can hold seven rounds inside its magazine and one more in the chamber. It was standard-issue side arm for the United States armed forces from 1911 to 1985 when it was replaced by the 9mm Beretta M9 (though the M1911 is still carried by some U.S. forces).
The M1911 is a common pistol design for police special teams because it is reliable in function, easy to modify by a gunsmith, and effective. The ‘1911’ in the name is because the pistol was adopted by the United States Army in the year 1911. M1911A1 pistols have an ‘A1’ added because they were changed from the original design in the 1920s in military service.
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