
In 1918 the Nobel Prize for Chemistry was given to Fritz Haber: he invented a method for synthesizing ammonia - that is, nitrogen 'fixed' with hydrogen - a chemical vital for organic life. The process was used during the First World War to make munitions: the allies got theirs from South American mines. Without industrial-scale production of ammonia, the war would have been considerably shorter. Verdun, for example - where a service took place today on WWI's 90th annivesary - was bombarded with a hundred thousand shells an hour - an hour! - at the start of the battle. (As well as a hundred thousand gas shells a day: Haber was instrumental in the development of gas warfare. Randomly, I now realise he was the subject of a brilliant Radio 4 play I caught the second half of. His scientist wife committed suicide. If the play is to be believed, this was to shock him into realising the monster he'd become. I buy that: radio 4 fiction will do for me as a factual source.)