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We go behind the scenes at the King County Library to catch a glimpse of their new sorting machine and find out what happens when you put that book in the return slot.

Every time four requests get made for a book, the library automatically orders another one. That way patrons don't have to wait to get their hands on best sellers. www.spl.lib.wa.us/

Read or Share this story: http://www.king5.com/story/entertainment/television/programs/evening-magazine/2014/08/04/13234194/