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Why has one of the world’s most important scientists been forgotten? He worked with something without which, we'd all be dead. It's in our DNA and the plants we eat could not exist without it. Fritz Haber was the brilliant German, Jewish chemist who used nitrogen to help feed billions but also used science to prolong the First World War where tens of thousands met a dreadful end. With Mike Williams. (Image: Fritz Haber Photo by Topical Press Agency/Getty Images)