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throwing
Throwing is the launching of a ballistic projectile by hand. This action is only possible for animals with the ability to grasp objects with their hands (mainly primates).
Humans, being bipedal, have a wide variety of throwing techniques and abilities. These have been employed in warfare – first through rock-throwing, then refined weapon-throwing (e.g. spear, throwing axe), and into modern day with hand grenades and tear gas canisters. Throwing is used in many sports and games, particularly ball games, and in throwing sports the action is the main determiner of the outcome. These serve as forms of recreation and exercise in society.
==History and prehistory==
Humans are believed to be unusually good throwers due to their high dexterity and good timing capabilities, and it is believed that this is an evolved trait. Evidence of hominid throwing dates back 2 million years to homo erectus.〔Melissa Hogenboom, "(Origins of human throwing unlocked )", ''BBC News'' (26 June 2013).〕 The 90 mph throwing speed found in many athletes far exceeds the speed at which chimpanzees can throw things, which is about 20 mph.〔 This ability reflects the ability of the human shoulder muscles and tendons to store elasticity until it is needed to propel an object.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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