Russia was gunning to build a 100 megaton H-bomb but decided against it because the nuclear fall out was too great.

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Clearly a smart guy in a nation producing lots of math whizzes (from Intel's Andy Grove to the H-bomb's Edward Teller), Simonyi won entry into the Hungarian state university at age 17.

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Macmillan realised that if the American Congress knew that the fire had been the result of reckless decisions taken to try to produce the-H bomb, they might veto Macmillan and Eisenhower's plans.

BBC: Windscale piles (NDA)