The book "IF" is based on what would be the reactions of the people, our scientists, elderly people and many others if our various organs place is replaced by each other. I mean to say that what would happen if your nose is at the place of our eyes and the eyes is at nose, or if our eyes are placed n mouth and mouth on ears and ears on eyes, or eyes on ear and on nose and nose on mouth and mouth on ear and many several kind of things. After that, what would the scientist gave this thing an advantage or disadvantage and various topologies are being disussed or please read this book and have fun and suggest this to make everyone laugh