Why Obsidian Blades Are So Freakishly Sharp😱

This blade is so sharp it can cut something you can't even see with the naked eye. It's made from obsidian, a volcanic glass formed when lava cools so quickly that crystals barely have time to form and that's where the crazy sharpness comes from. When obsidian breaks, it can fracture along an incredibly smooth edge producing a blade

far thinner than conventional steel blades. Some obsidian edges can reach just a few nanometers in thickness, but there's a catch. The same glass that gives it that razor-like edge also makes it extremely brittle. So it can create incredibly fine cuts, but one wrong [music] impact can shatter the edge.