Sometimes I think about how is this all going to end. It will, someday. As a rope that has a start point always has an ending point, human kind will not go on forever. But how, how are we going to end? Apart from the obvious meteor theory (which could happen tomorrow or in a billion years), the only possible scenario I can imagine is a nuclear war. It will probably happen someday.

Einstein said once: "I don't know how we are going to fight World War 3, but I know how we are going to fight in World War 4, with sticks and stones." I don't agree with him. There will be no one left.