The $5, $10, $20, and $50 bills have all been redesigned in the last decade or so, with the Federal Reserve adding color and watermarks to outsmart counterfeiters.
The last change made to the dollar bill was the addition of the line, "In God We Trust," which was added in 1963.
While we associate our nation's first president with the $1 bill, his was not actually the first face to appear on the currency.
According to the Treasury's Bureau of Engraving and Printing, that material is delivered (with the exception of what's used for $100 bills) in loads of 20,000 sheets that are each painstakingly tracked.
Not a bad return on investment: The Federal Reserve spends about 2.8 cents to produce every $1 bill (a much better deal than the 2.72 cents it costs to produce a penny).
According to the Federal Reserve, a dollar falls out of circulation on average about every 6.6 years.
Because of the cost and need to frequently reprint the heavily circulated $1 bills, it has acquired some powerful enemies.
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