About once a year our Sacramento Tracking And Wilderness Training group assembles every spark and ember creating device and every type of tinder we can find and have at fire-making. Different types of batteries, matches, lighters, bow and hand drills, flint and steel, ferrosteel, etcetera are turned on steel wool, lint, petroleum jelly soaked cotton balls, hemp twine fluff, dried leaf and grass, flares, fire gels, tinder pellets packs, ecetera. It takes most of a day to go through most of the variations. So far the Fire Department has not been called.