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Hundreds of allied bombes were built in order to determine the daily rotor start positions of Enigma cipher machines, which in turn allowed the Allies to decrypt German messages. The basic idea for bombes came from Polish code-breaker Marian Rejewski's 1938 "Bomba." That same year in Germany, engineer Konrad Zuse built his Z2 computer, also using telephone company relays. Spreadsheets, made up of columns and rows, have been used as business tools for centuries . A manual spreadsheet can be tedious to prepare and, when there are changes, a considerable amount of calculation may need to he redone. An electronic spreadsheet is still a spreadsheet, but the computer does the work. The most powerful computers can perform extremely complex tasks, such as simulating nuclear weapon experiments and predicting the development of climate change. The development of quantum computers, machines that can handle a large number of calculations through quantum parallelism , would be able