As medical science continues to progress, new facts emerge daily about our health and our bodies in general. Some of these facts are entirely new concepts that lead to entirely new fields of medical research. But, some of the strangest and most interesting bits of information that emerge are not new at all. They are often things that we have either intuitively known for generations, or things that we’ve learned through trial and error and experience, but have not been able to prove. Here are 10 health science facts that may or may not come as a surprise, but will explain a lot about ourselves, our health and our behavior.