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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’ Message Board). 
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"If the here proposed silica gel based technology can be further confirmed for Inca masonry this would raise the level of their work from “no secret formula beyond a primitive working technique based on stone tools” (Protzen,1986,1993) to an astonishing chemical-technical engineering standard."


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On the reddish, glittery mud the Inca used for perfecting their stone masonry 388 WVK 11-Feb-18 17:07

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