There is still a lot of interest in knowing about Einstein?s contributions in making of the atom bomb as is evident from the recent TV series GENIUS describing the life of Einstein and the NETFLIX movie on Einstein and The Bomb. Also there is great interest in the understanding of Einstein?s famous equation E = mc2 which is evident from the many books that have been recently written on this subject. This book will enable young school students to understand Einstein?s famous equation E = mc2, energy released from fission reactions which eventually led to the making of the atom bomb.