Across the planet, signs and symbols have become ingrained in everyday life. We are surrounded by icons that warn us of dangers, and some are incredibly recognizable. Whether it’s an icon of a fire or a person slipping on a wet floor, people have grown to understand symbols and the messages that they are trying to convey. But these concepts are not timeless. In fact, they could cause problems in hundreds or thousands of years from now, when they have potentially lost their meaning.
The truth is that danger symbols cannot be made to last. But why, exactly, is this the case? And how were biohazardous icons invented to begin with? Click through this gallery to find out.