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  Volleyball formerly called mintonette, was born in the United States in Holyoke Massachussetts.
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  A specific ball was designed for this sport
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  It refers to the dimensions of the court, the number of players per team is limited to six and rotation is incorpored into the service.
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  It was changed from 21 to 15 points
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  The number of touches was regulated and the attack by the defenders was limited
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  The United States Volleyball Association (USVBA, now USA volleyball) was formed
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  Was introduced in Tokyo
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  It was invented by William George Morgan, a physical education teacherat the YMCA.
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  It was an indoor team game with similitaries to basketball.
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  The figure of the Libero player is introduced
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  The duration of the encounters was significantly reduced
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  Two possible new changes are propossed and tested in some competitions
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  Finally it is only accepted in the revision approved in the congress of the same year, held in Dubai
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  The net touched rule is made and changed, the game is also made more flexible
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  Its teams are 6 people and can play any genre