A grateful Virginia mother has taken to Facebook to thank a white state trooper who helped her black son with a flat tire late at night - and her post has since been shared more than 20,000 times. Dr Nada Owusu wrote that her son Joseph, a Virginia Tech student, was on his way home from school last Thursday when his back tire blew out 'in the middle of nowhere'. She said her 20-year-old son was then approached by Virginia State Trooper Matt Okes, who she noted didn't ask Joseph if the Mercedes was stolen but instead 'got on his...