I am Md. Fardan Firoz living in Kolkata. I am a student of Class 9. This is my first book and I have tried to make every possible effort to frame it in a way so that you like it. I am a student and this book shows my best try to make my society better. Initially, I started writing this book as a hobby, but I did not even get to know that when this hobby changed to my dream. A dream for which I became too curious and excited. All credits goes to my parents. They always supported me in this field and I'm very lucky to have them. So I dedicate this book to them.