Usain St Leo "Lightning" Bolt, OJ, CD (/ˈjuːseɪn/; born 21 August 1986) is a Jamaican sprinter and currently the fastest human in the world. He is the first person to hold both the 100 metres and 200 metres world records since fully automatic time became mandatory. He also holds the world record as a part of the 4 × 100 metres relay. He is the reigning world and Olympic champion in these three events. Due to his unprecedented dominance and achievements in sprint competition, he is widely considered to be the greatest sprinter of all time. 
'
ဘာေျပာတာလား နားလည္ပု