He had sold, he believed, between 25 and 35 million copies of The Longest Day and 400,000 hardcover copies of The Last Battle in the United States alone. Yet each book had cost him some $150,000 to research. “I have no less than 7,000 books on every aspect of World War II. My files contain some 16,000 different interviews with Germans, British, French, etc,” he wrote. “Then there is the chronology of each battle, 5×7 cards, detailing each movement by hour for the particular work I’m engaged in. You may think this is all a kind of madness, an obsession. I suppose it is.”

He also told the German newspaper how he was dismissed by Hitler over a bizarre incident involving a fly.

The fly had been buzzing around the room during a strategy conference in July 1944, irritating the Nazi leader.

Hitler ordered Mr Darges to get rid of it, but the SS adjutant suggested that as it was an “airborne pest” the job should go to Luftwaffe adjutant, Nicolaus von Below.

He said Hitler then flew into a rage and dismissed him, saying: “You’re for the eastern front.”

‘Human beings are proud of what they create-no matter how controversial or deadly. Edward Teller revealed the essential secrets of the hydrogen bomb in a popular encyclopedia article. In 1995, Robert Henderson, the chief engineer for the Manhattan Project, sent back to Coster-Mullen an early version of the “Atom Bombs” manuscript, with comments such as “shit” and “pure shit,” and then went on to explain the exact (and still classified) process by which engineers made the lens molds that cast the explosives that squeezed the core of Fat Man until it achieved critical mass. Reading through President Truman’s diaries, at the Truman Library, in Independence, Missouri, Coster-Mullen found an entry dated July 25, 1945, in which the President marvelled that “13 pounds of the explosive” had made the shot tower at Alamogordo, New Mexico, disappear-a pretty accurate estimate of the amount of nuclear material contained in Fat Man.’

‘Much of the problem comes from our collective need to endow photographs with intentions – even though there are no people in the frame, including Fenton himself, who is conspicuously absent. The minute we start to conjecture about Fenton’s reasons, his intent – his psychological state – we are walking on unhallowed ground. Can we read Fenton’s intentions off of a photographic plate? Is there anything in the letters that tells us what he was really thinking and what really happened?’

The world’s first seven-sided coins started appearing in Britain’s purses and cash registers on October 14 1969 – strange, alien lumps of cupro-nickel alloy that were greeted with instant suspicion. Bus conductors and Tory MPs fretted that the new 50 pence piece would be mistaken for the old half-crown, causing chaos. Secret documents released years later showed that the Decimal Currency Board – the body charged with decimalising the country by February 1971 – was terrified that the Queen might die before the changeover was complete, forcing it to introduce a whole new set of coins. And according to the BBC, a retired army colonel named Essex Moorcroft founded an organisation called the Anti-Heptagonists, dedicated to eradicating the new 50p on the grounds that it was “ugly” and “an insult to our sovereign, whose image it bears.”