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From the viewpoint of physics (dynamics, to be exact), a firearm, as for most weapons, is a system for delivering maximum destructive energy to the target with minimum delivery of energy on the shooter. [citation needed] The momentum delivered to the target, however, cannot be any more than that (due to recoil) on the shooter.
The M16 rifle and the AK-47, two common firearms with significant influences on firearm design. A firearm is any type of gun that uses an explosive charge and is designed to be readily carried and operated by an individual. [1] [2] [3] The term is legally defined further in different countries (see legal definitions).
The "true gun" appears to have emerged in late 1200s China, around 300 years after the appearance of the fire lance. [4] [5] Although the term "gun" postdates the invention of firearms, historians have applied it to the earliest firearms such as the Heilongjiang hand cannon of 1288 [17] or the vase shaped European cannon of 1326. [18]
Gun safety is the study and practice of managing risk when using, transporting, storing and disposing of firearms, airguns and ammunition in order to avoid injury, illness or death. Gun safety includes the training of users, the design of firearms, as well as the formal and informal regulation of gun production, distribution, and usage. [1]
The earliest surviving firearm in Europe was found in Otepää, Estonia. It dates to at least 1396. [45] Firearms evolved during the 1419-1434 Hussite Wars. The Hussite army consisted mostly of civilian militia who lacked the skill, experience and often weapons and armor comparable to that of the professional Crusader invaders that they faced.
Chữ khoa đẩu is a term claimed by the Vietnamese pseudohistorian Đỗ Văn Xuyền to be an ancient, pre-Sinitic script for the Vietnamese language. Đỗ Văn Xuyền's works supposedly shows the script have been in use during the Hồng Bàng period, and it is believed to have disappeared later during the Chinese domination of Vietnam .
Ngô Bảo Châu (Vietnamese: [ŋo ɓa᷉ːw cəw], born June 28, 1972) [3] is a Vietnamese-French mathematician at the University of Chicago, best known for proving the fundamental lemma for automorphic forms (proposed by Robert Langlands and Diana Shelstad).
The Vietnam Academy of Science and Technology (VAST; Vietnamese: Viện Hàn lâm Khoa học và Công nghệ Việt Nam) is the largest and most prominent research institute in Vietnam. It was founded on 20 May 1975 as the Vietnam Academy of Science, then subsequently assumed its current name in 2008.