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Arrowcards, now that is cool instant arrowheads, just snap off and fix to an arrow, probably pretty lightweight also.
How to heat your home for just 8p a day using tealights and flowerpots
This is cool. Heat a room for pennies a day! Good to know this trick in case of an emergency.
DIY: Here’s an Ultra-Light Backpacking Stove for the hikers out there. Weights less than 2oz and boils water w/ about 1oz of 90% rubbing alcohol! (Tip: For a cleaner flame make the burner’s holes using pliers and a needle and dbl the # of holes shown.) {Rating: 5}