Cardio-pulmonary Resuscitation(CPR).

I think this is one of the most important things you can learn while you are in school, or for that matter any time in your life. It can save life's. You probably think that you would never have to use it, or that its not that important, or at least someone knows it. These are the things that you should not be thinking. You never know when or where you will need to know CPR.