As we all know, currently, the hardest substance on earth is diamond, but recently, substances harder than diamond have been discovered. Two Chinese scientists from Columbia University in the United States recently discovered that in pencil graphite, a carbon dioxide atomic crystal called graphene is harder than diamonds and 100 times stronger than the best steel in the world. This material It can be used to develop materials that are as thin as paper, ultra-light aircraft, and to create super-tough body armor. In short, if this material is widely used by the military and civilians, it will bring a revolutionary change to the use of materials in the world. /gnwkjdt/200509/t20050901_24479.htm