Usain Bolt leads Jamaica to relay world record

The world's fastest man Usain Bolt 4x100m relay anchored Jamaica to gold in world record for the last race of the 13th World Athletics Championships on Sunday.As so often before, Bolt crossed the line to fend for themselves and again the performances of all cast in shadow.Mo Farah was clinching 5,000 m gold for Britain in a great race, that a suitable climax, a dramatic Daegu playing great show,