Essentially the most widespread system of producing fire between prehistoric peoples was the friction system. Most commonly, a pointed hardwood was twirled involving the palms and pressed into a hole on the sting of the softer wood. Flint, pyrites, and fire drills are actually found in Neolithic web pages in https://qualified-fire-risk-asses90111.ja-blog.com/36376866/not-known-facts-about-choosing-the-right-fire-safety-expert-for-your-business