One of Australia's greatest-ever rugby league players, Wally Lewis, is the latest sports star to speak out about a diagnosis of Chronic Traumatic Encephalopathy (CTE) - the disease caused by repeated head knocks or concussions. So in this Squiz Shortcut, we take a look at why Wally's diagnosis is such a big deal, what our sporting codes are doing about CTE, and what’s happening with a Senate inquiry into concussions. Squiz recommends: Wally Lewis' 60 Minutes interview Our Squiz Shortcut on concussions and sport