It is impossible to imagine a more dramatic and horrifying combination of scientific triumph with political and moral failure than has been shown to the world in the destruction of Hiroshima. From the scientific point of view, the atomic bomb embodies the results of a combination of genius and patience as remarkable as any in the history of mankind. Atoms are so minute that it might have seemed impossible to know as much as we do about them. A million million bundles, each containing a million million hydrogen atoms, would weigh about a gram and a half. Each hydrogen atom consists of a nucleus, and an electron going round the nucleus, as the earth goes round the sun. The distance from the nucleus to the electron is usually about a hundred-m... (From : mcmaster.ca.)