WATCH
First watch appeared in central Europe in 15th century, but people wore they in pocket by 17th century. Later people wore they on hand. In 1657 Robert Hooke and Christian Huygens
invention the balance wheel who help on watch who we wear on hand. 
Today almost only people have a watch and they are fashion accessory too. We need watch because we must know when time is it.
I don't use watch because I don't need it. 
     
                         

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