By Arline Bradley Humans, despite being the most intelligent among all the other creatures, do not really know everything, there are lots of things that even the most educated person can not explain, there are phenomena that even field experts and those who had ekg and phlebotomy training in bronx can not fathom. One of the mysteries that remain unsolved is the human body itself. One of the most important parts of the human body include the blood. It serves as a natural courier, a deliverer of oxygen and nutrients to all the parts. The are about five to six liters inside each person. One can have more blood than the other person, depending on size. Each also has different types, the most common being O positive and the rarest being AB negative. This act also has numerous advantages...