Economy
Why ATM PINs have four digits
HERE’S THE INTERESTING PART
The bedrock of modern financial security is heavily reliant on one random woman's refusal to remember a slightly longer string of numbers. John Shepherd-Barron originally wanted a highly secure six-digit code for his new cash machine invention, but his wife complained it was too annoying to recall. Thus, the global standard was aggressively downgraded to four digits purely for marital peace.
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