In the second episode of our two-part special on the history of rugby union and concussion, we take a look how attitudes changed with the coming of professionalism in the 1990s.For a sport that came into the world with deep links to the medical profession, the 21st century saw it abandon its past in favour of new relationships with sports scientists - and it would be the players who lost out. For more on the history of rugby and the other football codes, take a look at www.rugbyreloaded.com (where you can find the links for this episode) and follow me on Twitter at @collinstony