Professor Richard D. Wolff on Fascism
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The Incas may have used metal parabolic dishes to focus the sun in order to cut the blocks precisely. They employed those principles also to smooth and glaze the rocks. This theory rings true and loudly!
https://www.latimes.com/archives/la-xpm-1986-06-15-mn-11299-story.html
Hard for me to believe this guy is in my age group, but he has some pretty good jokes!