Benjamin Franklin was a lot of things, but he always saw himself as a printer - and some of what he printed was currency for American colonies. Turns out he had some pretty creative ways to try to keep counterfeiters from copying his bills.
A group of researchers has been looking at the science behind digital pettiness - that’s like if you go out to eat with somebody and then use Paypal or Venmo to send them the exact amount of money to cover your order, down to the penny.
