What is the main idea of the following paragraph? Iron is the most common metal in today's society. It is used in the construction industry, vehicle manufacturing, machinery, cookware, weapons and tools, to name a few. Think of the surgeon's scalpel, the steel beams in a skyscraper, or even the wire in your spiral notebook. You can find iron, or a form of it, wherever you may be. Iron is not only a very strong material. It also has the ability to be magnetised. Iron in magnets is used in computers, televisions, electric guitars and even toys. Its many uses make iron a valuable commodity.