Task: Text Simplification
Input (English): 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.
Output (English): obsidian has been used in heart surgery , since its well-made blades have much sharper cutting edges than high-quality steel surgical scalpels , and have a blade edge of only about 3 nanometres wide.