Kenya's rise to top of world championships medal table soured by doping concerns

• Kenya now facing up to problems, says journalist who broke doping story• Physiology and technology both factors in country's success As it became clear that Julius Yego's javelin was soaring across nearly the entire length of the Bird's Nest pitch, and nearer than anyone else to the large scoreboard near the end of it, there were 50,000 gasps of astonishment. But the sight of Yego's country, Kenya, being way out in front of the medal table at these world championships with six golds, three...