¹     Did you know that a dollar bill, a five-dollar bill, a ten-dollar bill, and a one hundred-dollar bill all weigh the same? The approximate weight of all U.S. bills is one gram. There are 454 grams in one pound. If you had a pound of one-dollar bills, you would have $454.00!
 
²     The U.S. Department of the Treasury has been printing paper bills since 1861. During the Civil War, bills were printed for three cents, five cents, ten cents, twenty-five cents, and fifty cents. The paper "coins" had to be printed because people were saving their metal coins. They knew the metal coins would always be worth something.
 
³     The Bureau of Engraving and Printing calls bills "notes." The largest note ever printed was the $100,000 gold certificate. The largest note in use by the general public now is the one hundred-dollar bill.
 
⁴     The average amount of time a one-dollar bill lasts in use is about twenty-one months. One hundred dollar-bills last about eighty-nine months. They last longer because they are not passed from one person to another as many times as one-dollar bills are.

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