If you've noticed that your car has thick smoke coming out of the exhaust pipe, it may be a sign that your engine needs some attention. Just like you can examine an animal's stool to get an idea of its health, you can pay attention to the quality of your car's exhaust to get an idea of what's going on inside the engine.
The word sulfur has old roots. It comes from the ancient Latin word for sulfur, sulpur, which later changed to sulphur, perhaps under the influence of the Arabic word for yellow, sufra.
Sulphur. Sulphur is a bright yellow, tasteless solid and a very reactive element. It is found in a wide range of minerals and is one of the products of a volcanic eruption. Perhaps this is why many people of previous centuries associated sulphur (also known as brimstone) with the unpleasant afterlife known as Hell.