Scientists Say Time Travel is Impossible

‘In our lives, we have a lot of experiences and many of these we will remember until we die. We have many mechanisms for determining which experiences are stored (where were you on 9/11?) and which are discarded (what did you have for dinner exactly 1 month ago?). Some memories will fade with time and some will be distorted by generalization (can you distinctly remember your seventeenth haircut?). We need a signal to say, “This is an important memory. Write this down and underline it.” That signal is emotion. When you have feelings of fear or joy or love or anger or sadness, these mark your experiences as being particularly meaningful…These are the memories that confer your individuality. And that function, memory indexed by emotion, more than anything else, is what a brain is good for.’