Comment by tim333 Comment by tim333 5 days ago 2 replies Copy Link View on Hacker News I guess that before metal working, obsidian would have been the best knife edge available.
Copy Link caymanjim 5 days ago Collapse Comment - It's a far, far better knife edge than metal even now. It's used in some specialized scalpels. It's just fragile. Reply View | 1 reply Copy Link [removed] 5 days ago Parent Collapse Comment - [deleted] Reply View | 0 replies
It's a far, far better knife edge than metal even now. It's used in some specialized scalpels. It's just fragile.