90 Miles From Tyranny : Did You Know - How Sharp Obsidian Knives Are?

Sunday, May 11, 2014

Did You Know - How Sharp Obsidian Knives Are?


1 comment:

  1. That is one of the reasons why vascular surgeons use them...vessels seal much better and heal significantly faster.

    THe edge isn't ground, it is sheared, much like the making of a flint arrowhead or knife.

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