Fastest man on earth

Usain Bolt is the fastest man on earth, hi pas hundred meters long trek for only 9:58 seconds, 16 August 2009 in Berlin (Germany) and two hundred meters for only 19.19 seconds, 20 August 2009 Berlin.
Athletic specialists calculate that the 'flying Jamaican' in semi finals pas hundred meters trek in 40 steps, in final in just 41 steps. This means that hi made 4,27 steps in second, or that his every step was 2.5 meters long, at the one point he run 44.7 kmh ( 27.9 mph ).