You think throwing a coin into a river is superstition or just a way to make a wish? Wrong. This was not about luck. It was about cleaning water. The coins you see today are made of steel. But centuries ago, coins were made of copper 🥉 There was no RO. No water filter. People drank directly from rivers. Science tells us that copper has powerful antimicrobial properties. When thousands of people dropped copper coins into rivers, tiny amounts of copper slowly mixed with the water and helped kill