A rocket stove burns so efficiently that it ensures almost complete combustion prior to the flames reaching the cooking surface, so there is virtually no smoke. And they're easy to make! Click through (Diy Step Fitness)
A Swedish fire log, also known as a Canadian candle, is a log that has been vertically cut and set on fire. The log burns from the inside out and the fire can last for two to five hours depending on the size and material of the wood.