Cash is notoriously covered in germs; studies suggest that paper bills can contain bacteria and viruses, plus lead to the spread of disease.
The lifespan of various notes ranges 4 to 15 years, according to the Federal Reserve, meaning your bills have a lot of time to accumulate germs.
Some stores are insisting that you should use contactless payment methods instead of paper money.
Cities such as London, now only accept card payment on their transport network.
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