Репост из: Pilot | Ads and Marketing
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