One summer,a library in the United States was having a big problem.The books in the library increased fast but there was not enough room to hold them.They had to be moved to a newly built library across the town.Everything had been ready.Then the heads of the library found out that they hadn't left enough money to move their mountain of books across the town.Even the cheapest moving company was going to ask for several hundred thousand dollars to have books packed into boxes and moved.What could they do?Finally one clever librarian had a bright idea.She said that the move was going to take all summer and the library would be closed during that time.Why not ask everyone to come to borrow 20,40,or even 100 books?At the end of the summer they could return them to the new library.The idea worked successfully.Not only did the library save a lot of money,but also people read a lot of books.