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  Catapult

  A catapult is any one of a number of non-handheld mechanical devices used to throw or hurl a projectile a great distance without the aid of explosive substances—particularly various types of ancient and medieval siege engines. Although the catapult has been used since ancient times, it is proven...
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  Doctor

  Doctor, as a title, originates from the Latin word (gen.: doctoris) which means teacher. The word is originally an agentive noun of the verb docēre ('to teach'). It has been used as an honored academic title for over a millennium in Europe, where it dates back to the rise of the university. This...
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  Mortar

  A mortar is a muzzle-loading indirect fire weapon that fires shells at low velocities, short ranges, and high-arcing ballistic trajectories. It typically has a barrel length less than 15 times its caliber. A mortar is relatively simple and easy to operate. A modern mortar consists of a tube into...