As inflation reshapes global currency systems, the United States may be overdue not only to retire the penny, but also to ...

Discover the history, uses, and significance of paper money in the global economy. Learn how it's regulated and its role as ...

Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...