Scientists remember how difficult to invent the Internet which is called the greatest invention in 20th century.But they also wonder:what do they do it for?Just let the children addicted themselves in the virtual reality of the network,and can not leave it? Scientists remember how difficult to invent the Internet which is called the greatest invention in 20th century.But they also wonder:what do they do it for?Just let the children addicted themselves in the virtual reality of the network,and can not leave it?