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originally posted by: Trueman
a reply to: Spider879
I always thought the first combs were fish bones.
originally posted by: Spider879
I could imagine obsidian but I really don't know how sharp a tool that is compared to a doubled razor, scraping your scull with a stone ouch!
Well-crafted obsidian blades, as with any glass knife, can have a cutting edge many times sharper than high-quality steel surgical scalpels, the cutting edge of the blade being only about 3 nanometers thick. Even the sharpest metal knife has a jagged, irregular blade when viewed under a strong enough microscope; when examined even under an electron microscope an obsidian blade is still smooth and even.