Because it was his example of two human kinds living at the same time. He described Neanderthals and early modern humans sharing the same places for a long stretch, and saw humans and Raves in a similar situation, spread over a very long time. He noted that there is no evidence of Neanderthals attacking the newcomers, but doubted most Raves would be protected the same way, and said they could only survive with human care. He also said we are not going to witness the extinction of humanity. It is Ra's analogy, not a fact, a medical statement or a promise, and nobody knows how this will unfold.
This is not a fact, not medical advice and not a promise of healing. It is part of the cosmology Ra Uru Hu, who founded Human Design, left behind, and nobody knows exactly how it will unfold.
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