08:06WeekendFidel Castro's Ashes to be Laid to RestBBC World Service Duration: 23 minutes Sun 4th Dec 2016, 08:06 on BBC World Service OnlineCubans mourn Fidel Castro; How maths and music converge(Photo: Former Cuban leader Fidel Castro. Credit: Jorge Rey/Getty Images)GenresNewsFormatsMagazines & ReviewsBrandWeekend Source: BBC Online