Who hasn’t heard at least one variation of the old saw about how cutting your own firewood warms you twice? Perhaps your father said it as he sent you off to the woodlot with a handsaw, or off to the woodpile with a wedge and maul. And though Henry David Thoreau penned that saying in its original form before the advent of the internal combustion engine, whether firewood is cut and split by hand, or with the help of petroleum power, there is no doubt that the exercise is plenty warming.