Have you ever walked out in your backyard and heard the faint buzz of a chain saw in the distance, or passed a truck caring a load of logs on the interstate? Chances are that you have considering that wood is most commonly used building material of today's society. But have you ever given any thought to how or where the ability to gather such a large quantity of wood originated? Would you believe me if I told you that it came form the jawbone of an animal? Some four thousand years ago the interest in woodwork was increasing. This created the need for an effective way to quickly and smoothly cut a piece of wood. Around this time the discovery o