The largest detachment iceberg The largest detachment iceberg it happened a few days ago and was recorded by photographer James Balog of National Geographic. A piece of ice 7,4 cubic kilometers detached from a glacier in Ilulissat Greenland. The filming was done in the context of the documentary "Chasing Ice" that shows the effects of global warming.
The sharpest razor blade in the world Mike Cook, a researcher rocks, shows us how could someone be shaved before the invention of the metallic razor, using the sharpest blade in the world. The blade is made of Obsidian, a volcanic rock created by the rapid cooling of lava and can have a ridge so thin, as a particle. Ancient civilizations used Obsidian to build sharp knives and arrows.