History of McDonalds

Of course you won't be mistaken to say that the most popular fast food restaurant is McDonald's.They open new restaurant every 8 hours all over the world.Nowadays there are about 15000 restaurant all over the world.They all are self-service.They are cheaper and faster than usual restaurant.From the very beginning they were with open windows to see the kitchen all around.It was done that everyone cold see it was clean.