TIL - To demonstrate the sharpness of stone tools, Archaeologist Dr. Adrien Hannus elected to have major surgery done with obsidian blades rather than surgical steel scalpels. Obsidian is the sharpest substance known to mankind.

http://www.pbs.org/time-team/experience-archaeology/stone-blade-surgery/



Submitted April 10, 2015 at 12:46AM by duncanjchalmers http://www.reddit.com/r/todayilearned/comments/3215zg/til_to_demonstrate_the_sharpness_of_stone_tools/