Jesse Owens beat more than the clock on his way to immortality. His golden four-timer at the 1936 Berlin Olympics was a triumph over prejudice and left an indelible mark on history. Without the American’s trailblazing example, who is to say that Usain Bolt would even have got the chance to follow in his tracks and rewrite the record books as he has? Nobody tells Bolt to eat at ‘blackonly’...