What we know -- and what we don't know -- about those 74 seconds, and the Facebook video that made millions of people witnesses to Philando Castile's final moments.

4: The World is Watching

74 Seconds tells the story of a July 2016 traffic stop that ended with the world watching a man die, live on their phones. This is the story of that man, Philando Castile, and the officer who is about to go on trial for his death, Jeronimo Yanez. Through comprehensive reporting, MPR News examines this intersection of race, policing, justice and safety in America. A lot can happen in 74 seconds.