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A sock is extremely useful, absorbing a little more than a pint of sweat per day.
FACT or CRAP?
The pint of sweat might be accurate, but the rest of it is, shockingly, TOTAL CRAP. A good sock wicks moisture, rather than just absorbing it. So I'm going with semantics and saying it's crap, because it is.
Probably crap? I think more get lost than anything, especially pennies, I recall paper money having a useful life of 3-5 years and coins obviously last longer but get lost...
Spoiler
f@#k, I'm wrong... and actual credible source (US Mint) says 25 years is indeed the average.