Have you ever opened the hood of your car and wondered what was going on in there? Have you ever wondered how a engine powered by steam could push a heavy locomotive? Engines look like a big confusing jumble of metal, tubes and wires uninitiated. You might want to know what is going on in there simply out of curiosity. After all, you ride in your car every day, wouldn't it be nice to know how it works? Or maybe you are tired of going to the mechanic and having him say things that you are totally meaningless to you and then charging you $750 for it. Or perhaps you are buying a new car, and you hear words like "4.8 liter V6" and "dual overhead cams." What does it all mean?