Farthest journey by hoverboard (Guinness World Records/YouTube) Marty McFly eat your heart out! Canadian Catalin Alexandru Durum flies 275.9m (905ft 2in) on self-made hoverboard in his own case of back to the future. And it’s been declared a world record by the Guinness World Records, which has posted footage of the flight on its YouTube channel. The flight was achieved over Lake Ouareau in Quebec, Canada, on 25 August 2014 on a machine built and designed by the flyer, who said he was the…