8 facts about McDonald's hamburgers that might surprise you

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• The first McDonald's restaurant wasn't primarily a burger restaurant.
• The first "Big Mac" sold for 45 cents and was named by a 21-year-old secretary.
• The first Happy Meal was called a "Menu Ronald."

The first McDonald's franchise opened in 1955, and the chain has since become one of the most iconic food brands in history.

While McDonald's does have a varied menu...