The removal of unwanted body hair can be dated back to the time of the ancient Egyptians, who used abrasion as a way to remove hair. Ancient Romans and Greeks used pumice stones and other abrasives to remove hair. Native Americans and Pacific Islanders removed hair by scraping with seashells. In ancient Mayan and Aztec cultures, the volcanic glass obsidian was used to shave hair. Obsidian can be honed many times sharper than most razor blades.