You have to watch this! Destin from Smarter Every Day decided to explore the phenomenon called Prince Rupert’s Drop. When molten glass is dropped into cold water, the glass’s atomic structure is changed to make it completely unbreakable to any hammer strike. The only thing that breaks it is a tiny strike or nip at the end of the drop, and when nipped, the entire drop shatters in a super fast chain reaction at a speed of over one mile per second! The video explains further.