Bolt takes a tumble and can’t complete final race at worlds

LONDON (AP) — Usain Bolt was ramping into warp speed when suddenly, stunningly, the sprint turned into a somersault.
Fifteen steps into the final homestretch of his final race, something gave in his left hamstring. The World’s Fastest Man skittered to a stop — hopping, skipping, jumping, then finally dropping to the ground and tumbling forward before coming to a rest.
While the winning team from Britain crossed the finish line, Bolt was writhing on the track, where he eventuall