A Channel 4 documentary says DNA from a sofa in Hitler's bunker contains a marker linked to Kallmann syndrome, but experts say it's hard to evaluate the findings. CNN's Max Foster reports. | CNN International

What can a blood sample taken from Adolf Hitler’s bunker reveal about one of history’s most infamous figures? In a new Channel 4 and Blink Films documentary, 'Hitler’s DNA: Blueprint of a Dictator', experts Alex J Kay and Turi King marry genetics with history and reveal what a sample of the Nazi leader's DNA might be able to tell us about his health, behaviour and long-standing rumours about his private life. HistoryExtra’s Isabel King explains more, and you can read an in-depth article from Ale