Einstein's Dreams. Written by a physicist. A great fiction on the nature of how time could be. My favorite example from the book is about how one scenario says

Einstein's Dreams. Written by a physicist. A great fiction on the nature of how time could be. My favorite example from the book is about how one scenario says that time slows as we go up the mountains and most people stay there to preserve their youth and when they go down to the foothills, they go there for work!