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Dragunov (SVD-63) sniper rifle

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The  Dragunov sniper rifle  (formal  Russian :  Снайперская Винтовка системы Драгунова образца 1963 года Snayperskaya Vintovka sistem'y Dragunova obraz'tsa 1963 goda (SVD-63), officially "Sniper Rifle, System of Dragunov, Model of the Year 1963") is a  semi-automatic   sniper / designated marksman rifle  chambered in  7.62×54mmR  and developed in the Soviet Union . The Dragunov was designed as a  squad  support weapon since, according to  Soviet and Soviet-derived military doctrines , the long-range engagement ability was lost to ordinary troops when submachine guns  and  assault rifles  (which are optimized for close-range and medium-range, rapid-fire combat) were adopted. For that reason, it was originally named Самозарядная Винтовка системы Драгунова образца 1963 года "Self-Loading Rifle, System of Dragunov, Model of the Year 1963". It was selected as the winner of a contest that included three competing...
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Electroshock weapon

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A Taser, with cartridge removed, making an  electric arc  between its two  electrodes An  electroshock weapon  is an incapacitating  weapon . It delivers an  electric shock  aimed at temporarily disrupting  muscle  functions and/or inflicting  pain  without causing significant  injury . Many types of these devices exist. Stun guns, batons (or prods), and belts administer an electric shock by direct contact, whereas  Tasers (conducted electrical weapons) fire projectiles that administer the shock through thin flexible wires. Long-range electroshock projectiles, which can be fired from ordinary shotguns and do not need the wires, have also been developed.     
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History of computer technology

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Devices  have been used to aid computation for thousands of years, probably initially in the form of a  tally stick . [8]  The  Antikythera mechanism , dating from about the beginning of the first century BC, is generally considered to be the earliest known mechanical  analog computer , and the earliest known geared mechanism. [9] :279 Comparable geared devices did not emerge in Europe until the 16th century, [10] :94  and it was not until 1645 that the first  mechanical calculator  capable of performing the four basic arithmetical operations was developed. [11] :3                                                                                                             ...
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