A similar case can be made for replacing cash notes with coins. Paper cash carries copious filth, sometimes very dangerous viruses like eboli. Coins are much less suitable for viruses (recently reported in "Scientific American"). It was a shame to see the $1 coin fail in the US.
RE: Why I Drink Water From a Copper Vessel!
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Why I Drink Water From a Copper Vessel!
That is very interesting, I recall a story of bank tellers failing drug tests because of dirty money.
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