The British Bankers' Association annually organizes a two-week training course designed to help bank employees identify counterfeit currency. Throughout the entire training period, participants never handle a single counterfeit bill; all training materials consist of genuine banknotes. Lectures focus exclusively on the characteristics of authentic currency.How can one identify counterfeits without handling them? Many questioned the training's effectiveness. The banking system conducted follow-up studies on trained staff. Statistics revealed that employees who underwent this training demonstrated significantly stronger counterfeit detection skills. Experts explained that during training, participants handled and observed only genuine banknotes. Through repeated exposure, their fingers and eyes became attuned to the feel of authentic currency.When encountering counterfeit bills in their daily work, they feel distinctly uncomfortable. Though they may not consciously recognize the fake, their subconscious reacts: "This isn't real." After all, genuine currency has only one form, while counterfeits come in countless variations.