As pennies begin to disappear, states are grappling with a "rounding" problem for cash purchases that would have included them in the past.

States are setting new rules for cash purchases after the U.S. Mint stopped making pennies and the 1-cent coins get scarcer.

From John von Neumann’s universal machine to John Nash’s insight into computation, this video explores how computer scientists began measuring problems by the number of steps a machine must take as ...