Blood is more than just a life-sustaining fluid coursing through our veins as it carries genetic codes, ancient histories, and perhaps even extraterrestrial origins. For those attuned to deeper knowledge, blood can be a key to unlocking the mysteries of human evolution and our connections to otherworldly lineages. Two particularly intriguing aspects of this conversation involve Type O blood, the so-called Universal Blood, and the enigmatic Rh-negative factor, often linked to theories of reptilian ancestry. Let’s explore these concepts and understand which is truly the rarest blood type, and why.