Nature's sharpest knife #tiktok #foryou #fyp #Science

If you ever find a black stone in the wild, don't throw it away. It might be obsidian, sharper than a surgical scalpel by 500 times. Just break off a piece, and you'll have an incredibly sharp blade, sharp enough to cut through leather with ease. Obsidian is a type of natural glass formed when volcanic lava cools rapidly. It's mostly made of silica, and when it breaks, it creates razor-sharp edges. Ancient hunters used it to make spears and arrowheads. Modern tests show that an obsidian blade can slice through paper with a perfectly smooth edge. While a scalpel leaves a rougher cut, under a microscope, obsidian has a flawless, continuous edge. Unlike metal blades, which have tiny imperfections. However, despite its sharpness, obsidian is fragile and can break easily, which is why metal tools have replaced it in most cases. But in specialized surgeries, like neurosurgery and corneal procedures, obsidian blades are still an irreplaceable tool. So next time you come across a black stone in the wild, take a closer look. It might just be nature's sharpest blade.