Jamaican sprinter who's continuing to do some of his best work in 2012 and as early of 2012, he is the fastest human alive he would probably be the fastest human that has ever lived and you might not have made the association with these three gentlemen.Might not think they have lot in common but they were all obsessed with same fundamental question that differantial calculus addresses and the question is what is the instantaneous rate of change of something.