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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: Chuckles_Bee who wrote (18916)	8/22/2006 6:12:56 AM
From: E. Charters	Read Replies (1) \| Respond to of 78416

It is true. Quartz, obsidian or chert can achieve natural cutting edges on flaking that are perhaps .02 microns across. That exceeds the sharpness achievable by steel edges by an order of magnitude or more. cavemanchemistry.com Quechua indians in peru did brain surgery with a higher than modern survival rate, using quartz edge tools, cutting bone. mc.maricopa.edu ioa.ucla.edu gamedev.net blackwell-synergy.com If you don't believe this, break a glass and run your finger along the edge. Compare by running your finger along the edge of a modern hunting knife. Compare fineness of cuts under a microscope and bleeding time. I think a moments reflection will show you the experiment is unecessary. Glass wins. It is legendary in sharpness. obsidiandesigns.com Primitive man made arrow heads from bone cutting obsidian and flensing tools for scraping hides, cutting bone and cutting meat. They are very efficient and easy to repair. Aside from that, the leverage characteristics of the atl-atl and its flight physics are interesting. Shaft flexibility and point weight is important. EC<:-}