Years ago, when training someone to work at a bank, the new employee would be given stacks of bills to practice counting and sorting. Over and over, large stacks of bills are placed in their hands. They count through them and then another stack… and then another stack… and then another stack… and then another stack… and then another stack… …until one day they stop mid-stack. Something did not feel right. Did they miss a bill? Were two stuck together? What was different?  Back through the stack. Wait. There it was again. Something was wrong. That inconsistency was a counterfeit bill hidden in a pile of authentic bills, that would…