Do you keep some cash at home, “just in case”? You’re not alone. Many of us have a small reserve of cash for unexpected daily expenses. But did you know that heat, humidity, or improper storage can damage your banknotes over time? There is a simple and inexpensive trick that is becoming increasingly popular, a trick you may have come across before without really giving it a second thought. The use of aluminum foil to protect banknotes: where does this idea come from? We know it primarily for storing leftovers,