Open a can easily with nothing more than your bare hands

If you’re caught in a bind without a can opener, you can still get into your canned goods with this surprisingly simple trick. All you need is a rough surface and a little effort. Turn the can upside down and rub it vigourously over concrete, asphalt, or even a rough stone. In no time at all you’ll have ground off the thin layer of rolled metal at the edge and the can will pop open with just a little pressure to the sides.