Did you know that German scientists created the world's most acidic acid? It was called Substance N But we now know it as Chlorine Trifluoride, and it can: boil when exposed to air, explode when it touches water, kill you if inhaled, decompose into hydrofluoric acid, when ignited it can reach temperatures over 2400 degrees Celsius, and it's much more dangerous to handle than fluorine gas. Once, it was spilled and it ate through a concrete floor, and a meter of dirt and gravel beneath that. It was described as follows: "The concrete was on fire!"