For serious discussion of the controversies, approaches and enigmas surrounding the origins and development of the human species and of human civilization. (NB: for more ‘out there’ posts we point you in the direction of the ‘Paranormal & Supernatural
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You stated, "Very important part of this investigation to my mind."
If you want to crack this, then maybe answering the following questions might get us there:
"How did the pre Inca remove the organic skeletal remains from the quarry limestone and add microcrystals to the reconstituted mix? And why?
Nothing cryptic about that, is there?