The evidence for ancient human contact with extra terrestrial beings lies in the megalithic structures around the world, an author has said.

Michael Tellinger said that the construction of the structures was so complex that ancient people could not have done it without some kind of outside intervention and blasted critics who suggest that the feats could not have been accomplished, using primitive means.

"I would like to give them [critics] a thousand slaves and ask them to replicate some of these structures. Nobody's replicating that today," Tellinger, author of the controversial Slave Species of God, told News24.

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