The conversation between human and AI assistant.
[|Human|] Based on the following paragraph on the current use of obsidian, what's the difference between obsidian scalpels and steel scalpels?
[|AI|] Obsidian scalpels have a cutting edge that is many times sharper than a steel scalpel. In addition, obsidian scalpels have a smooth blade surface whereas all metal knifes have a jagged, irregular blade surface.
[|Human|] 
Based on the following paragraph on the current use of obsidian, what's the difference between obsidian scalpels and steel scalpels?