Cliffs Natural Resources is a publicly traded company, which means that individuals can indeed invest in its stock. To do this, one would typically need to open an account with a brokerage firm that offers access to the stock market. Once an account is set up, an investor can purchase shares of Cliffs Natural Resources on the exchange where it is listed. It is important to conduct thorough research before investing in any stock. This includes understanding the company's financial health, market conditions, and industry specifics. Additionally, potential investors should consider their own financial situation and investment goals. For the most accurate and current information related to stock prices and trading, it may be helpful to check financial news sources or Cliffs Natural Resources' official website.