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the important difference between 12-hour and 24-hour time is not actually the number of hours, but that zero had been invented by the time we came up with the latter
12-hour time is my favourite example of how zero is not necessary in modular arithmetic. similarly you can have the bit patterns 0000 through 1111 represent 0 to 15 or you can have the first one represent 16. there's applications of this! i wish programming languages supported it
@hikari you can make it happen in library code, right?