It was 12 September 1933. A little under 12 years later, the US dropped an atom bomb on Hiroshima, killing an estimated 135,000 people. The path from Szilard’s idea to its deadly realisation is ...

"We have made a thing, a most terrible weapon, that has altered abruptly and profoundly the nature of the world." Here is a video of the first nuclear bomb test: Read next ...