Mike Cook, a researcher rocks, shows us how could someone be shaved before the invention of the metallic razor, using the sharpest blade in the world. The blade is made of Obsidian, a volcanic rock created by the rapid cooling of lava and can have a ridge so thin, as a particle. Ancient civilizations used Obsidian to build sharp knives and arrows.

2 Comments

1. Guest says:

   15/12/2014 at 13:24

   οψιδιανός λεγεται….οχι οψιανος

   

   

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   • VideoMan says:

     15/12/2014 at 16:04

     Obsidian or Obsidian http://el.wikipedia.org/wiki/%CE%9F%CF%88%CE%B9%CE%B1%CE%BD%CF%8C%CF%82

     

     

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