Today, Superbowl LII captivates a global audience with all the pomp and excess that America is renowned for. 92 men don body armour and helmets, clashing and tackling their opponents for hours in pursuit of glory. But it isn't the players on the opposite end of the field that are the most dangerous though. There's a more insidious threat that hangs over the entire day: Concussions and the long-term effects on player's brains.