1) Why was it introduced?2) When did the euro replace the old currency for the participating nations?3) What sizes do the notes come in?4) What tones are euro coins made in?5) Where do they show a common design and various national symbols?6) Why do they vary slightly in size?7) When does the euro begin to be used electronically?8) When do euro notes and coins enter circulation?9) When was the local money completely replaced by the euro?