When Jack Johnson fought for his world title against Tommy Burns in 1908, it looked a bit like David and Goliath and starts quite a fascinating journey for us through not just the history of boxing (replete with elements of racial bigotry and hatred) but also an almost encyclopaedic look at the evolution of the coverage of the sport on film. This documentary offers us a surprisingly comprehensive chronology of the man, with little by way of useful narrative but with plenty of Miles Davis to immerse us thoroughly in this era. Dominant throughout the early part of the twentieth century, he…