Comment by br121

Research on the human body start with an observation, for the good reason that the omniscent orb has not invented yet, and what is causation and what is correlation is yet to be determined. Then, sometimes after years of research, it can be determined if what was observed was causation or correlation. That's why study that don't bring to a new discovery are extremely valuable nevertheless, as they show a path that was just a false lead and allow other researches to seek for something else