Evolution or Alien Intervention? | Ancient Aliens Special Presentation | Full Special

Video: "Evolution or Alien Intervention? | Ancient Aliens Special Presentation | Full Special" (History Channel)

Full auto-transcript: NARRATOR: Dramatic and unexplainable leaps in human evolution. DAVID CHILDRESS: We don't have the step-by-step changes that we were expecting to find. It's like humans are straight out of the incubator. NARRATOR: Evidence of tampering in the genetic code. GIORGIO TSOUKALOS: We became humans not due to an accident but a deliberate, artificial change of our DNA. NARRATOR: And new generations being born with supernatural abilities. There is genetic evidence to prove that humans are evolving at a rapid rate of speed. NARRTOR: Has mankind's development been orchestrated by an extraterrestrial hand? If so, what evolutionary upgrades may be next for the human race? TRAVIS TAYLOR: What humanity might become for spacefaring purposes is more like these gray aliens. NARRATOR: There is a doorway in the universe. Beyond it is the promise of truth. It demands we question everything we have ever been taught. The evidence is all around us. The future is right before our eyes. We are not alone. We have never been alone. Temple University, Philadelphia. 1992. History professor Dr. David Jacobs releases his book Secret Life. After over 30 years of collecting research data and interviewing hundreds of individuals claiming to have been abducted by extraterrestrials, Jacobs became convinced that aliens were using Earth as a genetic laboratory to create a new species of alien-human hybrids. I've looked at about 1,150, 1,175 different abduction events. And I became convinced that this was the real item, that the people actually were being abducted. And they all say the same thing, and it's global. They're put on a table. There are procedures that are applied to them. Men have sperm taken from them. Women have eggs taken from them. Very often, they're taken into other rooms where they see babies who look odd. They look sort of like a cross between human and alien babies. The question is: Are humans being manipulated to become a hybrid species themselves? NARRATOR: Although critics acknowledge that Dr. Jacobs' research is meticulous and methodical, they continue to dismiss the abduction phenomenon entirely. But could it be that extraterrestrials are actually using human DNA to add a new branch to the evolutionary tree? Ancient astronaut theorists say yes and suggest that alien intervention in human development has been happening since the beginning of mankind. And clues may be found in other humanlike species with whom we once shared the Earth. (wildlife chirping, calling) (hooting) Recreational spelunkers unearth a trove of humanlike fossils deposited deep inside a cavern known as the Rising Star cave. Paleoanthropologists determine that the bones are remarkably distinctive from any previously found early human remains and, upon further examination, decide that they are actually not human at all, adding a startling new piece to the evolutionary puzzle. They call this new species Homo naledi to correspond with the Dinaledi chamber it was discovered in, which translates to "chamber of stars." What is remarkable about these hominids is that they are a distinctive mix of both primitive and more advanced hominid characteristics. So there are some elements of Homo naledi, like the shape of the skull, the size of the teeth, the feet, the ankles, that are very humanlike. There are other characteristics, like the brain size, only about 500 CCs, so about a third of modern human brain size, and also aspects of the shoulder and the trunk that are much more primitive, much more similar to our earlier hominid ancestors. PETER WARD: The original thought is this might be really the first humans of Africa, seven to three million years ago. But this cave seemed newer. The way the bodies were placed seemed almost too regular. It looked as if there was at least ceremony to what was being done. And that of course suggests this would be a fairly well-on evolutionary advanced creature. NARRATOR: Finding the Homo naledi bones is considered the most astonishing human fossil discovery of the last 50 years, as it adds a baffling new branch to the human family tree. This is a tremendously exciting time. Both the fossil and the genetic evidence really underscore that there is much more diversity in human forms in our evolutionary past than we previously recognized. NARRATOR: The hominin, or hominid, branch of the evolutionary tree includes modern humans as well as the extinct human predecessors, such as Neanderthal, Homo habilis, Homo erectus, and other early, intelligent standing primates that have long since vanished. And despite many years of thinking otherwise, scientists are now discovering that many of these species coexisted. What we're seeing, really, is something, like, out of The Lord of the Rings, where we have all kinds of different humanoids who are tall and short, who have different color skins, different types of hair; even their brains are slightly different. Some are more animals or apes. Others are more refined. NARRATOR: Some researchers suggest that these recent discoveries may require a retooling of Darwin's theory of evolution, which was first proposed in 1859. In his work, On the Origin of Species, Darwin laid out the foundation for evolutionary theory by proposing that gradual multigenerational changes, occurring due to natural selection, would result in the modification of existing species. If the theory of evolution is correct, we should see a steady, slow progression. We're actually not seeing that. We're seeing the sudden surfacing of early humans who are actually very highly evolved. The scientific community explains everything away by nothing else but natural selection and coincidence. And the intelligent design camp suggests everything was done by God. What if this external force did in fact exist? But it may have been an extraterrestrial. NARRATOR: Could it be that the evolution of humans, and even prehuman hominin, might not be entirely what Darwin proposed? Might there be an even more profound explanation for the different species of intelligent hominin that once existed on Earth? Perhaps clues can be found by exploring the details contained within some of humanity's earliest stories of our creation. We have this notion that the people that were the earliest examples of a civilization were not the first attempts. That there were failures that came before, and finally they would come up with something better, and that would be the prototype that became the people. Sumerian texts speak of deformed humans created by Enki and the mother goddess Ninkhursag in the course of their efforts to fashion a perfect person. In all six, protohumans were made before they came up with what they wanted. In the Mayan text the Popol Vuh, the book of the people, it is said that there were three attempts to make people. NARRATOR: Could the stories of gods creating multiple versions of man, which can be found in the Mayan Popol Vuh, the ancient Sumerian texts and other writings, be accounts of what actually happened on Earth in the distant past? And if so, just who were these gods? There's a very good chance that early humans were possibly genetically manipulated by advanced extraterrestrials trying to formulate and create the ultimate human species. What if, at the heart of it, is the concept that the planet itself has been an experimental lab, an experimental garden, and that all of these different models getting to Homo sapien, that there had been all kinds of models, all for different reasons, all part of tests, all done by DNA manipulation by nonhumans in the extraterrestrial category? NARRATOR: Could the widespread mythologies about the creation of various human prototypes be real accounts of an extraterrestrial experiment, an experiment that continues to this day? Perhaps further clues can be found by examining the fossil discovery of real-life hobbits. NARRATOR: The Indonesian island of Flores, just north of Australia. September 6, 2003. Archaeologists seeking evidence for the first Homo sapiens migration to Indonesia come upon what they believe is the skull of a human child embedded in the earth 20 feet beneath the surface of Liang Bua cave. After several days of careful excavation, enough of the cranium and mandible are exposed to reveal that the teeth belonged not to a child but to a fully-grown adult. The skull, along with the skeletal remains that were recovered weeks later, belong to an ancient hominin that stood only three and a half feet tall. Scientists name the species Homo floresiensis, but they are more commonly referred to as "the Hobbits." The Flores hominids date to 16,000 to 18,000 years ago, a time period when we thought only anatomically modern humans existed. What is remarkable about the Flores remains is their tiny, tiny body size. And, as well, at least one of the specimens has a brain size that is only about the size of a chimpanzee, 300 to 400 ccs. And yet, you have tools that are consistent with anatomically modern humans. How to reconcile that is still an open question. CHILDRESS: The recent discoveries of these Hobbits on the island of Flores in Indonesia has really rocked the anthropological world. And anthropologists were really not aware and didn't think that there would be this miniature type of person, who's a distinct species from Homo sapiens. NARRATOR: Prehistoric stone tools found on the island of Flores suggest that these so-called Hobbits may have arrived there 800,000 years prior. How did this species get to the island? So, there are two options how this could've happened. One is that these Hobbit people arrived there on boats or they were planted there by extraterrestrials in the remote past. Some people even have suggested that this island served as some type of a petri dish because of its isolation. NARRATOR: Seven years after the initial Flores discovery, archaeologists stumble across yet another new species, 8,000 miles away in the remote Altai Mountains of Siberia. Isolated in a cave at an elevation over 2,400 feet above sea level, scientists discover a finger bone fragment and tooth of a previously unknown prehuman that existed at least 40,000 years ago. They name the species Denisovan after the name of the cave that the bones were found in. It's particularly fascinating that, when we look at the geographical distribution of the early humans, they're in different parts of the world. We have the Denisovans in Siberia and Russia. We have Homo floresiensis on the island of Flores, and the list goes on. It begs the question: How would that happen? Why would it not be the case that multiple different types of human would appear in multiple areas? But they had their own geographical locations. NARRATOR: Discoveries made in just the last two decades paint a picture of at least four distinct groups of intelligent hominins existing in isolated pockets of the world. Homo floresiensis isolated on the island of Flores, Denisovans being found in the Altai Mountains of Siberia, Neanderthal found occupying Western Europe, and anatomically modern humans evolving in Africa. Scientists don't entirely understand the role of geographic isolation, but what we know from studies of island populations of both humans and nonhuman species today is that isolated environments are fertile ground for producing unique and distinctive adaptations and also extremes in body size. NARRATOR: In 1972, renowned evolutionary theorist Dr. Stephen Jay Gould proposed a modification to the standard model of evolution. His punctuated equilibrium theory addressed evidence that changes in the fossil record came not as a steady process of gradual evolution, as proposed by Darwin, but rather in fits and starts. And these rapid changes seemed to primarily occur in situations of isolation. His theory continues to be considered controversial, as it also suggested that there must have been an unknown mechanism at play, but his research stops short of defining what this could have been. CHILDRESS: We don't have the step-by-step changes that we were expecting to find. So, we have to ask ourselves: Is there really this slow, random evolution, or are there sudden leaps, where suddenly there is a new kind of species that's just come straight out of the incubator? And so, it's like we have these different species of humans that are being developed in isolation in different parts of the world. GEORGE NOORY: I've always said that Earth is a planet of experimentation. I keep thinking of The Island of Doctor Moreau, where you're sequestered in a certain area, and you can conduct your work in quiet and in privacy. And there would be no reason why they wouldn't want to do this same thing here, rather than just simply take people and take them to a different planet and play around, which I think they do. Extraterrestrials would use islands for one experiment, tops of mountains for another experiment. But they would control what they were doing by keeping their different experiments separated from each other. Oceans, mountains, islands, peninsulas. TSOUKALOS: If you subscribe to the zoo hypothesis, which suggests that this entire planet is nothing else but an experiment for extraterrestrial entities, then one has to wonder: Could this be an experiment by extraterrestrials where, in the end, only Homo sapiens survived? NARRATOR: Could Earth have really served as an extraterrestrial incubation site for the development of early man? If so, was it limited to the creation of species? Or did the experimentation continue? Perhaps further clues can be found by taking a closer look at curious evolutionary leaps that further shaped the human race. A Stanford University study published in the journal eLife reveals a remarkable finding that dramatically changes our understanding of human evolution. The study reports that, since modern humans first emerged from earlier primates, roughly one-third of their evolutionary adaptations have been caused not by means of natural selection but by viruses. KIRSTEN FISHER: We have genes in our own genome that were derived from a retrovirus at some point in our history. And some actually have important functions for our development as humans. This suggests that there has been some kind of symbiotic relationship with viruses since the beginning of life itself. Sometimes viruses help human evolution. NARRATOR: According to another study, one important human adaptation that resulted from a virus is a special layer of the human placenta that prevents a fetus from being rejected by the mother's body. The genes that create this tissue are called syncytins, and they were not originally found in human ancestors. FISHER: They were acquired at a couple different points in our history, about 25 and 40 million years ago. And they're important for the connection between the mother and the fetus. NARRATOR: Some scientists now believe that viral genes like this were as important for human evolution as natural selection. RICHARD HOOVER: I think that horizontal gene transfer being carried out by viruses or phages was probably the primary mechanism whereby changes in species and major changes within a species occurred. NARRATOR: Was it by pure chance that viruses helped to create a species as sophisticated as humans, or might this viral evolution have been intelligently directed by beings from outer space? Anthropologists are telling us that humans evolved over time out of Africa, and that we had certain, uh, genetic leaps where we were suddenly smarter, our communication skills, uh, became greater. And so, these genetic leaps throughout evolutionary history might have just been a-a natural thing, but they could've been engineered as well. TSOUKALOS: There is no doubt in my mind that viruses that have originated from space somehow had to do with our development here on Earth. However, it is very clear that the ancient astronaut theory proposes that the one reason why we became humans as we are today is not due to an accident by some natural virus from outer space, but a deliberate, artificial change of our DNA. NARRATOR: Could humans be the subject of a bioengineering project by extraterrestrials, who use viruses from space to alter our evolution? And if so, could those viruses have been delivered to Earth in comets? Ancient astronaut theorists point to a curious event in our evolutionary history, the moment humans almost went extinct. Around 75,000 years ago, there was a bottleneck in human evolution. It's suggested that the human population actually went down from millions down to just a few thousand. This is certainly something that genetics backs up. And we have to ask ourselves: What was going on at this time? PHIL IMBROGNO: Originally, geologists believe that that bottleneck of humanity was caused by the super volcano in Sumatra exploding. Now, recent finds have indicated that's not the case, and they're leaning more towards a virus, a plague that was genetically programed for early humans, wipe them out. NARRATOR: One controversial theory is that the cause of this bottleneck event was not just a virus but a virus that was brought to Earth on a comet. According to this theory, a comet slammed into the planet with such devastating force that it created a nuclear winter, killing almost all human life on Earth. Almost, because those that could survive both the nuclear winter and the alien virus emerged as a profoundly altered and improved species. It was immediately following this event that humans first began to leave evidence of symbolic thinking: art, music and advanced language. Somehow, human beings reached another stage of evolution. It was the transformation of the human brain. Could it be-- and we believe it did happen-- that alien viruses infected planet Earth at this inflection point of the extinction of the human species? They implanted viruses in the human species that changed the brain. NARRATOR: The human brain, unlike the brains of animals, contains a large neocortex, the region responsible for language, logical reasoning and consciousness. In 2015, researchers in Germany determined that the human neocortex only developed after it was activated by a single gene. Our neocortex was mysteriously switched on, and nobody knows how. Of course, ancient astronaut theory says it's extraterrestrials. That beings came from elsewhere and tweaked our DNA. NARRATOR: If microbes from outer space were responsible for this profound change in human evolution, could it be that it was a deliberately orchestrated event, as ancient astronaut theorists suggest? Perhaps further clues can be found by examining the ingenuity of our nearest evolutionary cousin, the Neanderthal. NARRATOR: Archaeologists unearth a prehistoric grave containing three individuals buried side-by-side with their arms folded in a ritualistic fashion. Because of the manner of their burial, the archaeologists assume the remains are human, but are surprised to discover that they are actually our evolutionary cousin, Neanderthal. It takes a good deal of imagination to prepare the dead. It suggests some kind of notion of an afterlife. If there is that, there is usually a notion of a deity of some kind. That is fairly complicated religious thinking, suggesting that the Neanderthals had a capacity for symbolic reasoning and the formation of culture. This suggests a level of civilization, or at least the proto-culture, that is further along than we used to think. Neanderthals, unfortunately, because of early discoveries that made them look like a brutish caveman; not intelligent, that they're very, very different from us. They were shorter and stockier, but they had huge brains. They clearly had clothing. They cared for their sick and elderly. They were very intelligent. NARRATOR: In 2014, scientists analyzed materials from 40 different archaeological sites to determine a reliable extinction date for Neanderthals. The date they came up with is 40,000 years ago, suggesting they coexisted with Homo sapiens for at least 1,000 years. But just why did they die off? At this point, we don't know exactly why these other species died off. Certainly, it does broadly coincide with the expansion of anatomically modern humans to all parts of the globe. But contrary to our notions from the past, it doesn't look like it was a lack of intelligence that led to the demise of Neanderthals. NARRATOR: Although Neanderthals are long extinct, in 2013, evolutionary geneticists discovered select modern human populations carry genomes from both Neanderthal and Denisovans, suggesting that, at some point, interbreeding occurred. Neanderthal genetic markers are concentrated in populations in Europe and parts of the Middle East. Denisovan markers can be found in the mainland Asian populations, as well as Pacific Islanders, New Guineans and Australian Aborigines. According to some ancient astronaut theorists, this interbreeding may have led to the early demise of an extraterrestrial experiment with protohumans, leaving only Homo sapiens as the sole survivors. Consider the possibility that these different hominid strains were meant to be kept geologically separated from each other, across tracts of land that were considered to be too vast for them to ultimately come into contact with one another. Is it possible that interbreeding was frowned upon, and that once interbreeding with Neanderthals started to take place, it was damaging the very essence of the experiment? And because of that, Neanderthal strain had to be terminated or removed from the planet to stop this from happening. REDFERN: When we look at ancient texts, particularly religious texts, from millennia ago, what we find is the idea of the gods, or a god, wanting to create a human that was pure, sort of physically and morally. What we also find are accounts where the wrath of God or the wrath of the gods hammered down on us for essentially going off the rails, so to speak. And we could make a case that this was some example of extraterrestrial intervention to essentially try and purify again the species, and that might have involved wiping out significant portions of early humans and starting over. NARRATOR: Could interbreeding between different groups of early man have disrupted an alien experiment with human evolution? And if so, did extraterrestrials have a hand in choosing which species would survive? Ancient astronaut theorists say it's plausible and point to stories of unexpected interbreeding of humans and nonhumans that can be found in sacred texts that describe a time when humans shared the Earth with giants. Stories of giants can be found in the traditions of ancient cultures throughout the world. Native tribes of the American Southwest told of a race of red-haired giants, curiously similar to the accounts of the Celtic people of Europe, who described red-haired giants called the Tuatha Dé Danann. In India, early Sanskrit texts portray Buddha as a nine-foot-tall blue-skinned giant. And on Easter Island, local traditions have it that the enormous stone moai statues were erected by giants. In the Book of Genesis, it says that the sons of God came into the daughters of men. They created a hybrid offspring who are called the Nephilim, or the fallen ones. They're referred to as the giants or the mighty ones, and some believed they were between eight and 15 feet tall. ERICH VON DÄNIKEN: This is handed down not only in the Bible. This is also handed down in Sumerian languages that some of the gods had sex with humans, and the offsprings were giants. Mythology is full of giants, and we have to look at these old myths with modern languages, change the word of "angel" into "extraterrestrial." In the beginning of time, extraterrestrials had sex with humans, and the product of this sexual contact were giants. NARRATOR: According to the Book of Enoch, these hybrid offspring built a glittering high-tech civilization. But God considered them an abomination and sent a great flood to wipe them out. REV. BARRY H. DOWNING: When God makes plans to wipe out humanity, what he's wiping out is the extraterrestrial dimension of humanity that has come about through the pollution of human genetics. HENRY: Going back 5,000 years, we have sacred texts that tell us there was an antediluvian civilization. There was a great flood, and that there were survivors. The Mesopotamians speak of this in the Epic of Gilgamesh. The Egyptians speak of this in the Edfu Creation text. According to some traditions, some of the Nephilim survived the flood. These hybrid children still knew how to build megalithic monuments aligned with the stars, and that's what they did. CHILDRESS: We have to ask ourselves: Is it possible that the Nephilim were the actual builders of Stonehenge and other megaliths? And, in fact, uh, that may well have been the case. NARRATOR: Could a race of giant hybrid beings have once roamed the Earth, as described in the ancient texts? And might evidence of these giants be found among the massive stone constructions whose origins remain a mystery? Perhaps further clues can be found by examining a startling new genetic study indicating that almost immediately after one ancient megalithic site was constructed, its builders suddenly and mysteriously vanished. NARRATOR: In a groundbreaking genetic study published in the journal Nature, Harvard researchers announce a stunning discovery about ancient human DNA. It reveals that, immediately after Stonehenge was built, the people who built it, the ancient inhabitants of Britain, suddenly and almost totally vanished from the British Isles. They left behind virtually no DNA in the modern British population. What the 2018 study suggests is that the genetic signature of the Neolithic inhabitants of the British Isles, it vanishes shortly after the period in which they built Stonehenge and is largely replaced by an entirely new human culture in a very short amount of time. The Harvard study is an absolute bombshell. An entire civilization just disappears without a trace, vanishes into thin air? It's easily the most surprising and most shocking conclusion you can imagine. NARRATOR: The study used a revolutionary new technique that samples DNA from ancient human bones and then compares it to the DNA of modern people in the same place. Scientists then determine what percentage of the modern population is descended from the ancient group. So, the new genetic data are really providing an example of population replacement, in which the genetic markers that characterize one population is almost entirely replaced in a relatively short amount of time by the genetic signature that characterizes another population from a different part of the world. NARRATOR: The strange disappearance of the Stonehenge builders remains a profound historical mystery. Might it point to a deliberate cleansing of the human genetic line, as ancient astronaut theorists and the flood myths found worldwide suggest? Perhaps further evidence of this can be found with the recent discovery of a confounding genetic lineage that has proven nearly impossible to trace. Emory University. Atlanta, Georgia. 1998. Researchers analyze DNA data collected from various Native American populations in an effort to trace back their ancestral descent through the Bering Strait. The lineages are categorized into four haplogroups: A, B, C or D. Each line representing a different migration off the Asian continent between 20,000 to 30,000 years ago. But what they also find is that a small portion of the Native population falls completely outside any previously known genetic group. They can trace the ancestry back 36,000 years, but not to the Bering Strait. Scientists dub it the X lineage. Among human haplogroups, one stands out, the X lineage, which is found in about 2.5% of some Native American groups, and also in a small population of northern Europeans and the Middle East. And there's no connection between these groups. We couldn't understand why they're so different, the-these X haplogroups. NOORY: Isn't it amazing that you have a group of people indigenous, we think, to this planet, and you really can't trace what their ancestry was? Scientists throw up their hands, and they simply say, "I don't know how this can be." Because these people aren't somehow related to these people. How can this be? NARRATOR: While the source of this X lineage remains a mystery, some ancient astronaut theorists believe it might be connected to a lost race of people that were said to have existed throughout the world, including North America. CHILDRESS: It's possible that this X lineage gene is related to the giants that were reported throughout the world. Starting in the mid-1800s in America, archaeologists began excavating skeletons of giants who were seven to eight feet tall in many cases. NARRATOR: In the 1800s, Smithsonian archaeologists unearthed dozens of oversized skeletons contained within the burial mounds of the ancient Adena Indian tribe. The highest concentration of which were found in the Kanawha Valley of West Virginia, an area known to researchers as the "Valley of the Giants." Author and researcher William Henry is meeting up with a local Adena Indian researcher, Jason Jarrell, to have a look at one of these ancient earthworks. This is the Criel Mound, and this mound was excavated by the Smithsonian Institution in November of 1883. The Smithsonian sank a circular shaft from the top of this mound down through the center to the bottom. Wow. JARRELL: And that's where they found an elaborate tomb. This structure contained 11 burials. Ten of these burials were arranged in a semicircular fashion around a central personage. So, you have ten people around a central figure. What was significant about this central figure? According to A.R. Sines, who assisted in the excavation of this mound, the central burial, when measured in the tomb, was six-foot-eight and three quarters. Now, the skull had been pulverized by the excavation, so a complete measurement wasn't possible. So, in all likelihood, this individual was probably around seven feet tall. -That's a giant. -It's a gigantic humanoid. HENRY: So, we're saying the Smithsonian came here in 1883 and discovered a giant? That's correct. In fact, they discovered giants in many of the mounds here in Charleston. -There were originally 50 burial mounds in this valley. -Wow. And I've actually got some documentation -here to show you. -Let's see. This is the manuscript of the agent of the Smithsonian who excavated these mounds, and this represents his day-to-day journal of his excavations, including the one that's mentioned on this page, which is measured as seven foot six inches in length. Incredible. So, wait a minute, this is a government worker... -(laughs) who's out doing a job... -Correct. ...excavating a mound, and he discovers giants? Multiple gigantic skeletons. The ones in this valley being between seven and eight feet tall. That is incredible. So, why don't we all know about it? How come it's not in history books? Well, the policy of denial of the discovery of gigantic human skeletons actually wasn't enacted until about 1920. Uh, before that time period, the Smithsonian acknowledged these giants -in their own reports. -Absolutely amazing. For years, I've been hearing stories, Native American legends about giants. It appears that we've unearthed evidence, proof of their existence here in West Virginia, but, for whatever reason, that proof was suppressed. It probably has to do with the fact that it doesn't fit with our model of human evolution. We have to ask: Is there an extraterrestrial connection? CHILDRESS: You have these biblical stories of the Watchers and the Sons of God coming to Earth, breeding with humans to create this new race of giants, the Nephilim. These giant skeletons seem to be evidence of-of the Watchers and the Nephilim. We have to ask ourselves who these seven-, eight-foot giants were. Were they somehow the vestiges of these giants of the Bible? It's a mystery that archeologists have yet to solve. And part of the answer may be extraterrestrial DNA that's part of these giants. NARRATOR: Is it possible that the remains of a giant-sized population were discovered on the North American continent over 100 years ago? If so, were these beings a variation of Homo sapiens, an ancient intelligent hominin or an otherworldly species altogether? Perhaps further clues can be found by examining the rarest and most mysterious human blood type on Earth. NARRATOR: Houston, Texas. 2010. Doctors at the Texas Heart Institute examine a 59-year-old man complaining of chest pains and make an astounding discovery. The patient has a three-chambered heart, similar to that of a reptile. Researchers attributed the rare condition to an evolutionary phenomenon called atavism, when a lost trait of a distant ancestor reemerges in a modern organism. GAGE CRUMP: So, the idea is if you look at where we evolve from, we were first fish. Fish have a two-chambered heart, and then we came on land. We're more like a reptile that has a three-chambered heart. And then, eventually, a four-chambered heart as we became mammals and then humans. So, interestingly, during development, that same sequence of evolution is played out again as embryos. So, if there's any sort of defect in the embryo along the way, it could get stalled out at that earlier state. And now this man has a heart that's more typical of our distant ancestors, the reptiles. NARRATOR: While the discovery of a human with a reptilian heart is incredibly rare, other genetic conditions have been found that suggest a link with reptiles. Since the 1800s, over 100 cases of human tails have been reported in medical journals. People with the disease ichthyosis have dry, scaly skin. And people with the diseases called syndactyly and ectrodactyly have fused fingers and clawlike hands. But if such anatomical irregularities are a link to our ancient ancestors, as some scientists suggest, could it be that they are not the remnants of a reptilian stage in human development, but instead reveal that the human genome was comingled with that of the so-called reptilians. Ancient astronaut theorists say yes and believe that proof of alien hybrid experimentation can also be found in other unusual anomalies that appear to mirror the descriptions of divine beings from ancient texts. Millions of infants are born with blue patches of skin called Mongolian spots, evoking the blue-skinned gods common to India and Egypt. There have also been many cases of gigantism throughout history, bringing to mind biblical stories of the Nephilim, giants that were said to be the hybrid offspring of humans and divine beings called the Watchers. Within us is the whole evolutionary development of humankind, as well as the other species that humans developed from: reptiles, fish and so forth. Extrapolating this idea, if extraterrestrials had a hand in retooling our DNA, then do we also carry their genetic makeup within us, as we would? JASON MARTELL: We know today that our DNA contains a lot of junk DNA that we still don't understand. So, when we see these genetic anomalies surface in physical form in children, it could be that it's not an anomaly. It's actually a lost extraterrestrial gene, a marker that's now resurfacing at the right time. NARRATOR: Could there be extraterrestrial genes lying dormant in human DNA, as ancient astronaut theorists suggest? And if so, might a closer examination of bloodlines, passed down from our earliest ancestors, provide further evidence of this connection? Located between the border of Spain and France is the Pyrenees mountain range. The people that occupy this isolated region are known as the Basque, and they have long confounded anthropologists and historians. The language spoken by the enclave is not related to any other in that part of the world. And the population also has the highest concentration of Rh negative blood type on Earth. Up to 35% of Basque people have Rh negative blood. And Rh negative blood is one of the most unusual blood types. And it's the one blood type that is least likely to mutate or interact with other blood types. NARRATOR: Human blood types are grouped into four distinct designations that include O, A, B and AB. Additionally, there is another variance between blood types known as the Rh factor, or Rhesus factor, which is a measure of rhesus-based antigens in the blood. The name comes from a monkey from India and other parts of Asia, which is the rhesus macaque. And this monkey was used in experiments looking at blood transfusions. How blood was received from recipients varied. And it was discovered that the Rhesus factor could be positive or negative. Most humans in the world are Rhesus positive. NARRATOR: 85% of humans in the world are Rh positive and have no issues receiving blood from positive or negative donors. But for the Rh negative population, receiving Rh positive blood may be fatal, as the body will try to destroy the foreign antigens. And for women that are Rh negative, mating with an Rh positive partner could be detrimental to the fetus. If a Rhesus positive and a Rhesus negative, uh, parents were to have an offspring, there is a potential danger to the offspring because these two blood types can't interbreed, basically. Medical intervention is needed. It's why, actually, in the past, people had to have a blood test before they were allowed to get married. REDFERN: The very fact that an Rh negative mother, her body would actually try to kill an Rh positive baby generates bizarre scenarios. How on earth could this happen? It suggests, somewhere in our lineage, that the Rh negatives and the Rh positives are perceived as being profoundly different. And also, studies of Rh negatives suggest that they have lower than normal blood pressure, lower than normal pulse, in a number of cases, they have an extra vertebra in their back. WILL HART: Rh negative is very rare. Most of the world didn't have it until colonization started in the 15th century. Rh negative didn't exist in the Americas, and it didn't exist in-in southern Africa. It didn't exist in Asia. It was only in Europe, so it spread out from there. Out of Africa, that theory has it that all human beings originated in Africa, southern Africa, sub-Sahara, they're all Rh positive. They don't have any Rh negative. Where did Rh negative evolve, then? NOORY: 15% of the humans have Rh negative blood. Fifteen percent. And scientists have no idea where it came from. What they do believe is that, if you have that, you may have been evolved from a different kind of species on this planet. Now, was that species put here, genetically altered? Or was it just a natural formation of the planet in its evolutionary stage? Who knows? But the fact is that Rh negative people-- and again, there's 15% of them on this planet-- may have come from outside sources. NARRATOR: Could the Rh negative blood type offer evidence of a vastly different prehuman evolution than what we are led to believe in our history books? Might it offer indisputable proof of extraterrestrial intervention in the remote past? But, if so, is the experimentation with intelligent hominin over, or is it still taking place? NARRATOR: A decade and a half after Dr. David Jacobs wrote his book proposing that aliens are experimenting on humans, anthropologist Dr. John Hawks publishes research suggesting that humans have inexplicably experienced an accelerated evolution in recent history. Humanity entered into a supercharged period of evolution. If you look at DNA from a human walking around in 3,000 B.C., and you compare it to what we have today, it is seven percent different. What is this telling us? It could be that extraterrestrials are involved in that process, shepherding our genetic change through contact, through genetic work that they are doing. NOORY: Millions of people report being abducted. They can't all be