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Ballista is a device designed to launch heavy stones or other objects over long distances. In the past, it was used in warfare to breach city walls or destroy fortresses. Its operating principle is simple: force is accumulated using a lever, spring, or ropes, then released suddenly to propel the stone forward.How Did the Ballista Emerge?The ballista is believed to have first appeared in China. Chinese sources mention the use of ballistae as early as the 5th century BCE. It later spread to the We

What Is an Aircraft Carrier?An aircraft carrier resembles a massive airfield floating in the middle of the ocean. Yes, you heard that right! It is a huge ship with a long runway on which aircraft can take off and land, along with ample space to house them. These ships enable aircraft to carry out missions thousands of kilometers away from land, transporting both the aircraft and the personnel who operate them inside a vast vessel reminiscent of a city.How Does It Work?Aircraft carriers are not m