**What are the historical origins of banknotes, and how did they become a standard form of currency?
2. **How do central banks design and incorporate security features in banknotes to prevent counterfeiting?
3. **What are the environmental impacts of banknote production, and how are these being addressed through sustainable practices?
4. **How does the introduction of polymer banknotes compare to traditional paper banknotes in terms of durability and security?
5. **What factors influence the decision to issue a new series of banknotes, and how is public confidence maintained during such transitions?
