Winter is coming - with a touch of science! We talk to English comedian and writer Helen Keen about her new book The Science of Game of Thrones: A myth-busting, mind-blowing, jaw-dropping and fun-filled expedition through the world of Game of Thrones. Is it possible to crush a person's head with your bare hands? What really happens when royal families interbreed? Does Cersei have Borderline Personality Disorder? What curious medical disorder does Hodor suffer from?