Also found on bills: fecal matter. A 2002 report in the Southern Medical Journal showed found pathogens — including staphylococcus — on 94% of dollar bills tested. Paper money can reportedly carry more germs than a household toilet. And bills are a hospitable environment for gross microbes: viruses and bacteria can live on most surfaces for about 48 hours, but paper money can reportedly transport a live flu virus for up to 17 days. It's enough to make you switch to credit. [More]
Also: the $ (dollar sign) is not found on the currency.