Obsidian has been used in cardiac surgery, as well-crafted obsidian blades have a cutting edge many times sharper than high-quality steel surgical scalpels, with the edge of the blade being only about 3 nanometres wide.
Obsidian has been used in cardiac surgery. Well-crafted obsidian blades have a cutting edge that is sharper than high-quality steel surgical scalpels. The edge of the blade is about 3 nanometres wide.