In an ideal scenario you'd have a lighter, matches or fire starter with you when you get stuck in the wilds, but as long as you have a sandwich bag you can use the power of the sun to ignite kindling.
Oddly enough a battery and a foil gum wrapper can also be used to start a fire:
A one-handed way to make fire. Connecting the foil of a wrapper to the positive and negative ends of the battery creates a weak circuit. Since this foil isn't built for that transfer, the energy has nowhere to go. The end result is a flame.
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