Usain Bolt, the fastest man in history, runs his last 100m

Usain Bolt, the global track star from Jamaica, ran his last 100m dash on Saturday at the 2017 world championships, concluding a record-breaking career that spanned three Olympic Games. Christopher Clarey of The New York Times joins Hari Sreenivasan to recap Bolt’s achievements and discuss what his retirement -- if it sticks -- would mean for the sport.