Re-Seal Plastic Bags
All you need to do is place a long piece of aluminum foil at the top of the plastic bag, fold it over the edge of the bag, as shown in the image, and iron it shut.
DIY Touchscreen Pen
You can use aluminum foil to create your own touch screen pen. All you need is a small piece of aluminum foil, a pen or pencil, and tape. Wrap the end of the pen or pencil in the aluminum foil and secure it with a piece of tape. In the winter you can make your regular gloves work with your touchscreen too by putting a small piece of aluminum foil on the tip of the fingers.