The Star System of U.S. Currency Errors and the World’s First Programmable Computer

US currency sometimes has a star marked on it near the serial number. If and when something goes wrong during the printing process of currency, the paper being used must be pulled out and the serial numbers cannot be used again. The star system is an accounting system which denotes that something went wrong during the manufacturing of the currency produced in that batch and therefore there is a gap between the currency which was printed properly and the star note itself, as the serial numbers in...

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