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Know about the fundamental limitation of chemical tests and the advantage of scanning electron microscope in detecting the source of gun residues
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James Watt as a young man, c1769. Scottish engineer and instrument maker. Invented the modern steam engine which became the main source of power in Britain's textile mills. His engine had a separate condenser in which steam from the cylinder; (see notes)
Weaponry, Energy, and Power Systems Quiz
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Gun Control in the U.S.
Woman hand pulling a pistol out of handbag
Pro and Con: Concealed Guns
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German machine gunners occupy a trench during World War I.
Weapons of World War I
Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.
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Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that
America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)
Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
10 Greatest Baseball Players of All Time
Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg
Spies Like Us: 10 Famous Names in the Espionage Game
A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
14 Tough Questions Answered
Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society
The 10 Greatest Basketball Players of All Time
Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.
Why Is the Mona Lisa So Famous?
earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
The 6 Deadliest Earthquakes Since 1950

gun

weapon
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gun, weapon consisting essentially of a metal tube from which a missile or projectile is shot by the force of exploding gunpowder or some other propellant. In military science, the term is often limited to cannon larger than a howitzer or mortar, although these latter two types, like all tube-fired artillery pieces, also fall within the general definition of a gun. Guns also include such military small arms as the musket, rifle, machine gun, and pistol, as well as such nonmilitary sport firearms as the shotgun. Bazookas and other rocket launchers, which launch self-propelled projectiles, are not guns, though they perform many of the same functions. (See also military technology.)