This chemistry teacher is about to teach his students a science lesson they won't soon forget. More than just boring calculations and graphs on homework assignments, chemistry is the living reaction of parts to the world around us. In this case, the teacher is using liquid methane. Methane, a chemical compound that's one atom of carbon and four atoms of hydrogen, just in case you've forgotten some of your own high school chemistry. Because of its availability and its low levels of carbon dioxide released on burning, methane is popular for natural gas. By reducing methane to its liquefied state, the methane takes up only 1/600th of the volume of gaseous methane. But be careful: as this teacher is about to demonstrate, liquid methane is mega flammable.