ATMs began appearing in churches providing a way for people to come up with ready cash to give to God and their church. But why was cash necessary?
What's on your cash? Studies show our money carries everything from pet DNA and old food to E.coli and traces of cocaine.
Currency first hit the scene thousands of years ago. An anthropologist explains the early origins and uses of money – and how archaeological finds fill in our picture of the past.
Fifty years after the first ATM went into service, the main problem – identifying authorized users – remains the same. But methods for doing so have improved significantly.