A barmy scientist who claims at least 119 UFOs have crashed into earth says it's unlikely humans could procreate with visitors from outer space.
Dr Steven Greer, who claims to have met aliens, was talking to YouTube channel VLAD TV when he poured doubt about natural reproduction between the species. In what could be seen as a blow to Star Trek's Captain Kirk in his heyday, the boffin added there may be hope via controversial classified experiments.
Despite certain types of extra-terrestrials having a similar physical form, he said it would likely prevent 'normal' reproduction. Dr Greer said there was one type of species that would look like first cousins, but wasn't sure with his understanding of reproduction whether it would be possible.
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"Now obviously with CRISPR (an editing DNA technique) and with cloning, and with other technologies you could do some things," he said.
"But in terms of normal reproduction, I doubt that very much."
However, Dr Greer added that experiments had been carried out which crossed human with extra-terrestrial DNA, in classified projects.
.He said: "There are some rather monstrous programs that would make Mengele in Nazi, Germany - the doctor who did all these horrible things with human experimentation - blush.
"And I know about them, I know people who worked in them."
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He continued: "So have there been some of these things done?
"By humans, not by the ETs, yes.
"And you get into some very strange life forms that look partially human, partially extra-terrestrial, as a result of these programs."
He added: "Scientifically there's no reason why a bunch of mad scientists, in covert programs, with what they have, couldn't do it."
Dr Greer said he'd spent 33 years getting to the bottom of the programs that were being carried out.
"When I think I've hit the end of how gruesome and crazy these covert programs get, I hit another sub-basement of crazy," he said.
Dr Greer also revealed that humans from poor areas have been used for further terrifying experiments aimed at creating a human-machine conscious interface, essentially hijacking the navigation systems of spacecraft.
He also added that these programs were ongoing.
The former emergency room doctor has told previously how he founded the Disclosure Project in 1993 to expose the US Government's withholding of UFO information from the public.
Over several decades he said untold numbers of alien craft had been observed in Earth's airspace able to reach extreme speeds with no visible means of lift or propulsion and perform stunning manoeuvres at g-forces beyond any human-made craft.
Dr Greer said some of these extraterrestrial spaceships had been 'downed, retrieved and studied since at least the 1940s and possibly as early as the 1930s'.
To see the clip click here.
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