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How to boil water without a fire?
You will need two cardboard boxes. The smaller one is painted black. The bigger one is lined with foil. On a sunny day, this design will heat 10 liters of water to boiling in 2 hours.
SURVIVOR#advice
You will need two cardboard boxes. The smaller one is painted black. The bigger one is lined with foil. On a sunny day, this design will heat 10 liters of water to boiling in 2 hours.
SURVIVOR#advice