original: 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.
simplifications: Obsidian has been used in heart surgery, because they are a lot sharper than steel blades. The edge of their blade is 3 nanometres wide. Obsidian has been used in cardiac surgery because it's blades have a cutting edge sharper than high-quality steel. The edge of the blade being about 3 nanometres. Obsidian has been used in cardiac surgery. Well-crafted obsidian blades have a cutting edge many times sharper than steel surgical scalpels. The blade's edge is about 3 nanometers wide. Obsidian has been used in cardiac surgery. This is because well-crafted obsidian blades have a cutting edge about 3 nanometres wide, making them much sharper than steel surgical scalpels. Obsidian has been used in heart surgery. Well-made obsidian blades have a cutting edge many times sharper than high-quality steel surgical scalpels. The edge of the blade is only about 3 nanometres wide. Obsidian has been used in heart surgery because obsidian blades can be much sharper than steel surgical blades. Obsidian has been used in heart surgery. Well-made obsidian blades have a cutting edge much sharper than surgical steel scalpels. Obsidian has been used in heart surgery, as well-built obsidian blades have an edge much sharper than steel surgical knives, 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. 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 blade edge being only about 3 nanometres wide.