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-You start a fire with an aluminum can and a chocolate bar rubbing the chocolate all over the bottom of the can.
-Then, polish with a towel the bottom of the can and repeat the procces several times until the bottom of the can shines, and reflects like a mirror.
-Find the direction of the sun, and place the bottom of the can in that direction.
-Reflect the sun on pieces of paper, strow and other incandescents materials.
Finally, froends will be impressed when they see a fire going on.