The first US dollar bills, created in 1862, were issued to finance the Civil War. And because their reverse sides were printed in green and black, they got the nickname “greenbacks.” But, in part to combat counterfeiting, the designs had to change. In 1935, the familiar Seal of the United States – which includes a pyramid with an eye on top – was introduced to the back of the dollar bill. The Latin inscription under the pyramid reads, “Novus Ordo Seclorum” – and means “a new order for the ages.” Over the years, paper money has literally shrunk – by 30% – and undergone many small adjustments. The latest change happened in October 2013, with the 100-dollar bill featuring a Liberty Bell that switches color from copper to green when tilted – in an effort to battle counterfeiting. This new 100 bill has been said to be uncounterfeitable. Back in 1862, over a third of the currency was fake; today, the Department of Treasury estimates there are currently only 70 million counterfeit dollars in circulation. Proving the more things change, the more some things try and stay the same.