This article explains the origins of Ice Hockey and goes into detail on the evolution of the sport from the very begining, to the present day.

The history of boxing, from its beginning in the Old Greece, to its evolution until the contemporary days, with the various weight / ranking categories and the new modern rules introduced by the Great Britain.
Includes also the most recent medical studies that confirmed the permanent damages caused to the brain by this sport, studies that had the consequence of banning boxing in some countries like Cuba, Korea, Norway, and Iceland.