Source: wiki/Inca_Empire, by Gordon McEwan, The Incas: New Perspectives The Incas lacked the use of wheeled vehicles. They lacked animals to ride and draft animals that could pull wagons and plows... [They] lacked the knowledge of iron and steel... they lacked a system of writing...
Source: www.cheops-pyramide.ch Franz Löhner shows, that granite can't be processed without iron tools!
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Source: wiki/Inka Werkzeuge und Waffen wurden aus Kupfer und Bronze hergestellt. Eisen war unbekannt.
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Source: wiki/Bronze Mit dem Sammelbegriff Bronzen werden Legierungen mit mindestens 60 % Kupfer bezeichnet, soweit sie nicht durch den Hauptlegierungszusatz Zink den Messingen zuzuordnen sind.
Source: wiki/Kupfer Kupfer = 3.0 Mohs Härte
Source: wiki/Zinn Zinn = 1.5 Mohs Härte
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said by Brien Foerster at video-position 0:16 - 0.38 and 1:26 - 1:31 and 2:46 - 2:53. Basalt
said by Brien Foerster at video-position 1:07 - 1.12 and 2:37 - 2:44. Granite
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Source: www.reference.com/science Granite is a 6 to 7 on the Mohs hardness scale. The Mohs hardness scale was developed by the German mineralogist Friedrich Mohs to determine the hardness of a mineral based on whether it can be scratched by a substance of known hardness.
The 10 standard minerals of the Mohs hardness scale from softest to hardest are
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Source: said by Brien Foerster at video-position 3:22 - 3:31 These walls average three feet(91.44cm) thick and there is no gap from the front all the way to the back.
Source: said by Brien Foerster at video-position 5:13 - 5:20. ...in the Cusco area. And the erosion indicates 1000 upon 1000 of years of age.
Source: said by Brien Foerster at video-position 5:26 - 5:38. ...as well there are stories of tunnels in the Cusco area. Ancient tunnels underground that go supposably for miles upon miles....
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