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I. Introduction The nature of this experiment was to see what year the U.S. Mint changed the composition of the pennies. In this lab we may use anything to determine when it happened. We are not allowed to damage the pennies in anyway. For our hypothesis we didn’t have one because we had no prior education on the composition of pennies. II. Materials and Methods Materials: 1) One set of 10 pennies ranging from the year 1970’s to the late 1980’s. 2) An Graduated cyl