We all love seeing those slow motion replays that reveal facts that cannot be seen definitively in real time. In a game that is becoming more and more precise, NFL referees have the impossible task of being everywhere at once to observe the action and make calls accordingly. To help them get every call right, there are cameras capturing the plays from every angle. In this episode of the NFL explained. podcast, Mike Yam and Michael Robinson take you through the evolution of the instant replay and talk about where it may be headed in the future.