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No technology is perfect, it's always a process. And effectively every computer-related technology has undiscovered bugs. https://around.com/ariane.html https://around.com/ariane.html ""The board wishes to point out," they added, with the magnificent blandness of many official accident reports, "that software is an expression of a highly detailed design and does not fail in the same sense as a mechanical system." (...) (...) really important software has a reliability of 99.9999999 percent. At least, until it doesn't. " The statistics is against that generous number of nines.