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Worlds Sharpest Knife Obsidian vs 60,000 PSI Waterjet
In the last obsidian video we cut it into a cube. This time we decided to do some waterjet cutting and make a knife out of it. Trump Slaps Colombia With 25% Tariffs, Sanctions in Migrant Dispute ...
The New York Times1y
Yellowstone National Park’s Obsidian Cliff
Over about 11,500 years, the stone has been fashioned into deadly knives, razor-sharp spear points, arrowheads and darts for atlatls, or spear-throwers. The obsidian columns of Yellowstone have ...