Knowing the difference helps us know how to answer questions in a correct formate. No one likes an open answer to a closed question.
However, we started to discuss even BIGGER questions: Essential or Enduring questions. These have no easy answer and people can spend their life trying to answer one question. These are the questions we really think about and inspire us to work hard. Below is a short reading from a site (forget where I got it), but I thought it might help you understand these types of questions more.
After you look at it and rewatch the clip form GUNS, GERMS and STEEL, can you explain why Jared Diamond's question can be called an ESSENTIAL QUESTION. If so, leave a comment.