Life Giving Aluminum Foil

Did you know that a simple piece of Aluminum Foil could save your life?  Let's say you get stranded somewhere and you need to signal for help.  Use the shiny side of the foil to reflect the sun to get people's attention.  What if you have a fire but only rancid water to drink?  Fold the foil into a bowl and you can boil and drink it.  What if you grow extremely cold but only have some batteries from your flashlight or radio?  Wrap the batteries in the foil one at a time and squeeze the ends so the foil presses tightly to the - and + ends and they will heat up just like a hand warmer.