in 1888,John Loud,who was a tanner of an American factory,invented a new type of pen--
ball-point pen.The ball-point pen has many advantages than the old type of pen.First,it is more smaller and lighter.Secondly it helps people to write faster and make life easier in many fields.The last but not the least is that the price of the ball-point pen is pretty low,which can help it to be widely used.Also it has disadvantages,such as needing refilling,sometimes leak.In a word,the ball-point pen has huge impact on the age.