09:30HARDtalkDr Henry MarshBBC World News Duration: 30 minutes Wed 28th Dec 2016, 09:30 on BBC WORLD NEWS North AmericaStephen Sackur talks to one of Britain's leading brain surgeons, Henry Marsh. Show more ContributorsPresenter:Stephen SackurGenresFactualFormatsDiscussion & TalkBrandHARDtalk Source: BBC Online