O man! what has deluded you in respect of your Noble Lord? He Who created you and formed you and proportioned you and assembled you in whatever way He willed. (Surat al-Infitar: 6-8)Children, the wide world you enter as you read this book is one of enormous concern to you. You may not have realized it so far, but trillions of workers are currently working on your behalf in this giant world. They are also to be found in every single human being. You will be astonished as you read this book and learn how these workers in your body, the wide world in question, are cells, far too small to be visible to the naked eye.